What Do They Put In Swimming Pools

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What is in a swimming pool?

A swimming pool is more than just a body of water for swimmers to enjoy. It requires various components and systems to ensure clean and safe water for everyone. In this article, we will delve into the different elements found in a swimming pool, including the water itself, filtration system, circulation system, and heating system.

A. Water

Water is the primary component of any swimming pool. However, it’s not just regular tap water that fills up these pools. Several chemicals are added to maintain proper hygiene and prevent the growth of harmful microorganisms.

1. Chlorine

Chlorine is one of the most common sanitizers used in swimming pools due to its effectiveness against bacteria and viruses [^1^]. It works by forming hypochlorous acid when it reacts with organic matter like sweat or urine from swimmers[^2^].

2. pH balancers

Maintaining proper pH levels in a swimming pool is crucial for optimal chemical reactions and swimmer comfort[^3^]. The two main types of pH balancers commonly used are:

  • Sodium carbonate: Also known as soda ash, sodium carbonate increases pH levels when they are too low.
  • Sodium bicarbonate: This substance raises both alkalinity levels and stabilizes pH within an acceptable range[^4^].


Algae growth can be a nuisance in pools as it creates an unsightly appearance on walls or floors [^5^]. Algaecides help prevent algae formation by inhibiting their growth or killing them off entirely[^6 ^].

B.Filtration System

The filtration system plays a vital role in removing debris such as leaves, hair strands from swimmers’ bodies ,and other particulate matter that may find their way into the pool.

1.Sand filters

Sand filters use specially graded sand as their filtering medium. As water passes through the sand bed, it traps and removes impurities, leaving cleaner water behind [^7^]. Maintenance of sand filters involves backwashing to remove accumulated dirt and replacing the filter media when necessary.

2.Cartridge filters

Cartridge filters consist of a pleated fabric cartridge that captures debris as water flows through them[^8^]. These types of filters are known for their high filtration efficiency but require regular cleaning or replacement to maintain optimum performance.

3.Diatomaceous earth filters

Diatomaceous earth (DE) filters use a powdered substance made from fossilized diatoms to trap tiny particles in the pool water[^9 ^]. This type of filter offers exceptional clarity but requires careful maintenance due to its delicate nature.

C.Circulation System

The circulation system ensures that pool water is constantly moving, preventing stagnant areas where bacteria can grow. It consists of various components:


The pump is responsible for circulating the pool water by pulling it from the skimmer and returning it through jets[^10 ^]. There are different types of pumps available, including single-speed, dual-speed, and variable speed pumps. Regular maintenance includes checking for clogs or leaks and ensuring proper operation.


A skimmer is located at one end of the pool’s surface area and helps remove floating debris before it sinks into deeper areas. The skimmer basket collects leaves, insects,and other larger particles ,preventing them from reaching further into the filtration system [^11 ^].

#### 3.Return Jets

Return jets push filtered water back into the swimming pool after going through all filtration processes . Their strategic placement ensures even distribution throughout the entire body rather than concentrated in specific spots.

D.Heating System

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Swimming pools often require heating systems to regulate temperature during colder months or provide comfort for swimmers who prefer warmer waters .

### 1.Gas Heaters

Gas heaters use natural gas or propane to heat the pool water, providing rapid temperature adjustment [^12^]. They are effective in heating large volumes of water but can be expensive to operate and maintain.

### 2.Electric Heaters

Electric heaters convert electrical energy into heat through a heating element. These heaters are generally more cost-effective than gas heaters, making them a popular choice for residential pools[^13 ^].

### 3.Solar Heaters

Solar heaters utilize the sun’s energy to warm the pool water. They consist of solar panels that capture sunlight and transfer it into heat, which is then used to raise the temperature of the pool[^14 ^].

II.Chlorine in swimming pools

Chlorine is an essential chemical compound found in most swimming pools as it effectively kills harmful bacteria and viruses that may cause diseases or infections.

A.Purpose of chlorine

The primary purpose of adding chlorine to a swimming pool is sanitation. It helps control pathogens and microorganisms present in the water, keeping swimmers safe from potential health risks [^15^].

B.Types of chlorine

There are several forms of chlorine available on the market:

1.Liquid Chlorine

Liquid chlorine contains sodium hypochlorite as its active ingredient [^16 ^]. It provides immediate sanitization when added directly to pool water but requires careful handling due to its corrosive nature.

2.Chlorine tablets

Chlorine tablets release stabilized forms of chlorinating agents slowly over time . They come in various sizes and dissolve gradually when placed inside a floating dispenser or automatic chlorinator.[17]

#### 3.Chlorine granules

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Chlorine granules contain calcium hypochlorite as their active ingredient[^18 ]. Granules dissolve quickly when added directly to the pool , making them ideal for shock treatments or maintaining proper chlorine levels.

C.Chlorine dosage and testing

Maintaining appropriate chlorine levels is crucial for effective sanitization while ensuring swimmer comfort. Regular testing helps determine the chlorine levels in the pool, allowing adjustments to be made accordingly.

1.Chlorine levels

The ideal chlorine level in a swimming pool should range between 1-3 parts per million (ppm) [^19^]. This ensures sufficient disinfection without causing irritation or strong odor.

#### 2.Testing methods

There are various ways to test chlorine levels in a swimming pool:

- Test strips: Dip a test strip into the water and compare its color against a chart provided with the kit[^20 ^].
 - Liquid reagent kits: Add drops of liquid reagent into a sample of pool water, then observe any changes in color. The intensity of color change corresponds to the chlorine level[^21 ^].

3.Balancing chlorine levels

To balance out low or high chlorine levels, specific actions can be taken:

  • Low Chlorine Levels:

    If chlorine readings are below optimal ranges, additional doses of liquid or granular chlorines may be added until desired concentrations are achieved . However , it’s essential not to overdo it as excessively high doses can cause skin irritation and unpleasant odors [^22 ^].

  • High Chlorine Levels :

    In case of elevated chloride concentrations , balancing chemicals like sodium bisulfate or muriatic acid can lower them back within acceptable limits [^23 ^] .

III.pH balancers in swimming pools

pH balance refers to maintaining an appropriate acidity or alkalinity level within the recommended range for safe swimming conditions.

A.Importance of pH balance

Proper pH balance is vital because :

  • It affects swimmers’ comfort by preventing eye irritation and skin rashes caused by excessively acidic water.

  • It helps optimize the effectiveness of chlorine and other pool chemicals [^24 ^].

B.pH increasers

pH increasers are used when pH levels fall below the ideal range.

#### 1.Sodium carbonate

Sodium carbonate, also known as soda ash, is commonly used to increase pH levels. It dissolves quickly in water and effectively raises alkalinity[^25^].

2.Sodium bicarbonate

Sodium bicarbonate works similarly to sodium carbonate by raising both alkalinity and pH levels. It is often used for smaller adjustments or maintaining stable conditions [^26 ^].

### C.pH decreasers

When the pool’s pH level rises above recommended ranges ,pH decreasers are needed .

#### 1.Sodium bisulfate

Sodium bisulfate reduces both total alkalinity and pH levels .It comes in granular form , making it easy to add directly into the water[^27^].

2.Muriatic acid

Muriatic acid (hydrochloric acid) is a potent substance that can quickly lower both total alkalinity and pH values .Its highly acidic nature requires careful handling during application [^28 ^] .

IV.Algaecides in swimming pools

Algae growth not only creates an unsightly appearance but can also pose health risks for swimmers. Algaecides help prevent algae formation or kill existing algae within the pool.

A.Purpose of algaecides

Algaecides serve multiple purposes:

  • Preventing algae growth: Algaecides create an environment inhospitable for algae development, reducing their chances of thriving within the pool.

  • Killing existing algae: In cases where algae have already formed, specific types of algaecide treatments target different species to eliminate them entirely.

B.Types of algaecides

Several types of algaecides are available on the market, each with its own unique characteristics and mode of action.

1.Copper-based algaecides

Copper-based algaecides utilize copper ions to inhibit algae growth. They are effective against a broad range of algae species but may cause staining if not used correctly[^29^].

2.Quaternary ammonium algaecides

Quaternary ammonium compounds, also known as “quats,” work by disrupting cellular membranes in algae, leading to their death[^30^]. These types of algaecides have minimal impact on water chemistry and do not stain surfaces.

3.Polyquat algaecides

Polyquat or polymer quaternary ammonium compounds combine properties from both copper-based and quat-type algaecides. They offer broad-spectrum effectiveness while being gentle on pool surfaces[^31^].

C.Algaecide application and dosage

Proper application and dosing of algaecide ensure optimal results:

  • Follow manufacturer’s instructions: Different products may have varying recommended doses based on their active ingredients.

  • Apply evenly: Distribute the correct amount throughout the pool water for thorough coverage.

  • Regular maintenance: Depending on environmental conditions ,additional doses may be required to maintain algae-free conditions .

V.Filtration system in swimming pools

The filtration system is essential for keeping the pool water clean by removing debris such as leaves, hair strands ,and other particulate matter . Let’s take a closer look at different types of filters commonly used in swimming pools .

### A.Role of filtration system

A well-functioning filtration system ensures proper circulation within the pool while trapping impurities along the way . This helps prevent cloudy or dirty-looking water that could otherwise harbor harmful microorganisms [32 ].

### B.Sand filters

Sand filters use specially graded sand as their filtering medium. Water is pushed through the sand bed, where debris gets trapped in between the grains[^33^].

1.How sand filters work

When water passes through the sand bed, larger particles are caught on top while smaller ones penetrate deeper into the filter media. This process ensures efficient removal of impurities before returning clean water back to the pool.

2.Maintenance and cleaning

Regular maintenance is essential for proper sand filter operation:

  • Backwashing: As debris accumulates within the filter media ,pressure increases, reducing filtration efficiency . Periodic backwashing reverses water flow to flush out trapped dirt .

  • Sand replacement: Over time ,sand becomes worn-out or contaminated with oils and other substances that impair its performance . Replacing it every few years helps maintain optimal filtration [34 ].

C.Cartridge filters

Cartridge filters use a pleated fabric cartridge as their primary filtering element. The cartridge traps debris as water flows through it [35 ].

1.How cartridge filters work

As pool water passes through cartridges’ porous surface area, fine particles get captured within them while allowing cleaner water to continue flowing.

#### 2.Maintenance and cleaning

Periodic cleaning or replacement of cartridges is crucial :

- Rinse off loose debris : Use a garden hose or pressure washer to remove any loose material from the cartridge's surface.
 - Deep clean : Cartridges can be soaked in specialized cleaning solutions overnight before rinsing thoroughly.[36 ]

### D.Diatomaceous earth (DE) filters

Diatomaceous earth (DE) filters utilize a powdered substance made from fossilized diatoms as their filtering agent[37].

#### 1.How diatomaceous earth filters work

DE powder coats grids inside these types of filters which acts like microscopic sieves trapping even tiny particulate matter down to two microns in size [^38 ^].

#### 2.Maintenance and cleaning

Careful handling is required when maintaining DE filters :

  • Backwashing: Similar to sand filters, backwashing removes accumulated debris by reversing water flow through the filter.

  • Adding fresh DE powder : After backwashing ,a fresh layer of diatomaceous earth should be added to ensure optimal filtration.[39 ]

VI.Circulation system in swimming pools

The circulation system ensures that pool water is continuously moving, preventing stagnant areas where bacteria can grow. It comprises various components working together for efficient water flow.

A.Importance of circulation

A well-designed and properly functioning circulation system provides several benefits:

  • Uniform distribution of chemicals: Properly circulated water ensures even distribution of sanitizing agents like chlorine throughout the pool.

  • Enhanced filtration: Moving water allows for more effective removal of impurities by passing them through the filtering medium.

### B.Pump

The pump acts as the heart of a swimming pool’s circulation system. It draws in pool water from skimmers or drains and pushes it through the filtration system before returning it via return jets[^40^].

1.Types of pumps

There are different types of pumps available for swimming pools:

- Single-speed pumps: These are standard on/off pumps with a fixed speed motor that operates at one constant speed setting.
 - Dual-speed pumps: As their name suggests, these pumps offer two preset speeds—high and low—to adjust performance according to requirements[^41^].
 - Variable speed pumps (VSPs): VSPs allow users to adjust motor speeds within a wide range based on desired flow rates or energy efficiency needs .They tend to consume less electricity than single- speed or dual-speed models .

2.Pump operation and maintenance

To ensure proper operation and longevity, regular pump maintenance is crucial:

  • Inspection: Check for any signs of leaks, unusual noises, or vibrations that may indicate a problem.

  • Cleaning strainer basket: The pump’s strainer basket collects debris and should be cleaned regularly to prevent clogs that may affect performance [^42 ^].


The skimmer is an essential component in the circulation system as it helps remove larger debris before they reach the filtration system. It is typically located at one end of the pool’s surface area[^43^].

1.Function of skimmer

Skimmers create a flow pattern within the pool that directs floating debris towards them. As water enters the skimmer, it passes through a collection basket where leaves and other large particles get trapped.

2.Skimmer maintenance

Maintaining clean and functional skimmers involves regular care:

  • Emptying collection baskets: Depending on environmental conditions, these baskets may need frequent cleaning to ensure optimal operation.

  • Clearing blockages: Occasionally check for any blockages within the skimmer line or opening that might restrict proper water flow [^44 ^].

D.Return Jets

Return jets play a vital role in maintaining proper water circulation by reintroducing filtered water back into the swimming pool. They are strategically positioned around different areas of the pool to ensure even distribution.

1.Purpose of return jets

Return jets not only help maintain consistent temperature throughout but also contribute to even chemical distribution . This ensures uniform sanitization and prevents stagnant zones where bacteria could proliferate.

#### 2.Adjusting return jets for optimal circulation

Proper adjustment of return jet positions allows for better control over water movement :

- Aim directionally : Point return jets downward towards walls or across surfaces rather than straight up .This facilitates effective movement patterns .
 - Angle adjustments : Experiment with different angles or orientations to find what works best for your specific pool shape and size [^45 ^].

VII.Heating system in swimming pools

While some swimmers prefer cooler waters, others enjoy a more comfortable temperature. Heating systems provide the ability to adjust water temperatures according to individual preferences.

A.Benefits of a heating system

Having a heating system offers several advantages:

  • Extended swimming season: With the ability to warm up pool water ,swimming can be enjoyed beyond just hot summer months .

  • Enhanced comfort : Warmer water temperatures ensure greater comfort for swimmers, especially during early mornings or late evenings when outside temperatures are cooler .

### B.Gas heaters

Gas heaters utilize natural gas or propane as their fuel source .They heat up pool water quickly and efficiently[^46^].

1.How gas heaters work

Gas burners ignite within the combustion chamber ,heating copper tubes where cold pool water circulates .This results in rapid temperature elevation before returning heated water back into the swimming area.

#### 2.Gas heater maintenance

To ensure optimal performance and longevity :

- Regular inspection: Check for any signs of corrosion, leaks, or damage that might impact operation.
 - Clean burners: Remove debris or residue buildup from gas burners periodically .

C.Electric heaters

Electric heaters rely on electrical energy to generate heat through a heating element. They offer an efficient option for maintaining desired water temperatures without burning fossil fuels[^47^].

1.How electric heaters work

Water flows over an electric resistance coil inside the heater unit while an electrical current passes through it.This process generates heat that warms up the circulating pool waters .

#### 2.Electric heater maintenance

Regular upkeep helps extend lifespan and maximize efficiency :

  • Inspect wiring connections: Ensure all electrical connections remain secure.

  • Cleaning elements : Remove mineral deposits or other accumulated substances from heating elements occasionally to maintain optimal performance [^48 ^].

D.Solar heaters

Solar heaters utilize the sun’s energy to raise water temperatures. They are an environmentally friendly and cost-effective option for heating swimming pools.

1.How solar heaters work

Solar panels, usually installed on roofs or ground-mounted structures, capture sunlight and convert it into heat. Water is then circulated through these panels, absorbing thermal energy before returning back into the pool[^49^].

#### 2.Solar heater maintenance

Keeping solar heaters in good working condition involves:

  • Regular cleaning: Remove any dirt or debris that may accumulate on solar panels.

  • Inspection: Check for leaks or damage to ensure proper operation [^50 ^].


In conclusion ,swimming pools consist of various components and systems that work together to provide clean, safe ,and comfortable swimming environments . From maintaining appropriate chemical levels with chlorine ,pH balancers ,and algaecides ;to filtering out debris using sand filters ,cartridge filters,and diatomaceous earth filters ;to ensuring proper circulation with pumps ,skimmers,and return jets;and finally regulating water temperature with gas heaters,electric heaters,and solar collectors—all these elements contribute to creating a pleasant experience for swimmers .

With regular testing and maintenance of these essential components,pool owners can enjoy their backyard oasis all year round while keeping the water crystal clear and free from harmful microorganisms.


Q: What is the purpose of adding chlorine to a swimming pool?

A: Chlorine serves as a sanitizer in swimming pools by killing harmful bacteria and viruses that may cause diseases or infections.

Q: How often should I test my pool’s chlorine levels?

A: It is recommended to test your pool’s chlorine levels at least once a week during normal operating conditions. However, additional testing may be required after heavy usage or following adverse weather conditions.

Q: What is the ideal pH range for a swimming pool?

A: The ideal pH range for a swimming pool should be between 7.2 and 7.8, which ensures optimal water balance and swimmer comfort.

Q: How often should I backwash my sand filter?

A: Sand filters typically require backwashing every 1-2 weeks, depending on the filter’s size and usage frequency. Regular maintenance will help ensure proper filtration efficiency.

Q: Can algaecides completely eliminate algae in my pool?

A: Algaecides are effective at preventing algae growth or killing existing algae when used as directed. However, additional steps may be required if an extensive outbreak occurs.

Q: Do solar heaters work well in all climates?

A: Solar heaters rely on sunlight to generate heat, so their effectiveness can vary depending on the amount of sunlight available in your specific location. In regions with abundant sunshine, solar heaters can provide significant temperature increases.


strong smell – A noticeable and potent odor that can be detected in swimming pools, often associated with the presence of chlorine or chloramines.

cyanuric acid – Also known as stabilizer or conditioner, it is a chemical compound added to swimming pool water to protect chlorine from degradation caused by sunlight.

indoor pools – Swimming pools located inside enclosed structures, such as buildings or facilities.

chlorine in swimming pools – The most common disinfectant used in swimming pool water treatment. It helps kill bacteria and other microorganisms that may be present.

Sodium Hypochlorite – A liquid form of chlorine commonly used for sanitizing and disinfecting swimming pool water.

Calcium hardness – Refers to the amount of dissolved calcium minerals present in the water. Proper calcium hardness levels help prevent scaling and corrosion in the pool system.

dose of chlorine – The amount of chlorine added to achieve desired sanitization levels in a specific volume of pool water.

chlorine demand – The measure of how much additional chlorine is needed to effectively sanitize the pool due to factors like contaminants or high bather load.

sodium bicarbonate – A substance used for increasing alkalinity levels in pool water, which helps maintain pH balance and prevent acidity fluctuations.

chlorine tablets- Solid forms containing concentrated amounts of chlorine that are slowly released into the pool when placed inside an appropriate chemical feeder or floater device

outdoor pools- Swimming pools located outside exposed to weather elements like sunlight, rain, wind etc..

Pool operators- Individuals responsible for managing and maintaining public or private swimming pools according to established regulations

public pools- Pools accessible for use by members of the general public. These are typically regulated by health departments and have stricter maintenance requirements compared to private residential ones

swimming pool water- Water contained within a designated area specifically designed for recreational activities like swimming

tablet form-The physical shape/form taken on by chemicals such as Chlorine tablets when manufactured into solid tablets

smell of chlorine- A distinct odor often associated with swimming pools that have a sufficient level of free chlorine in the water. It is generally considered a sign of adequate disinfection.

hardness – Refers to the presence of dissolved minerals, particularly calcium and magnesium, in pool water. Maintaining proper hardness levels prevents scaling or corrosion issues.

metals – Elements such as iron or copper that may be present in pool water due to various sources like groundwater or chemical imbalances. High metal concentrations can lead to staining and discoloration.

chemical feeder- A device used for automatic dispensing of chemicals into the swimming pool system, ensuring consistent treatment and maintenance levels.

water source- The origin or supply point from where water is obtained for filling up swimming pools, which can vary depending on location (municipal supply, well water, etc.).

levels of chlorine- The concentration or amount of free available chlorine measured within the swimming pool water at any given time

element Chlorine – An essential element commonly used as a disinfectant in various forms for maintaining clean and safe swimming pool conditions

balanced water – Refers to properly adjusted chemical parameters including pH, alkalinity, calcium hardness and sanitizer levels necessary for optimal swimmer comfort and equipment protection.

sulfuric acid – A strong acid sometimes used in small amounts during pH adjustment processes to lower high alkalinity levels if needed

Bromine tablets – Alternative sanitizers similar to chlorine tablets but containing bromine instead. They are effective against bacteria and other microorganisms found in swimming pools.

Swimming pool chemicals- Various substances specifically formulated for use in treating different aspects of swimming pools’ chemistry requirements such as sanitizing agents, balancing agents etc..

pool clean-The state where a swimming pool’s physical environment is kept clear from debris such as leaves , dirt , hair etc..

pool walls-The vertical surfaces that enclose the perimeter area around a specific designated space filled with water, forming the pool structure.

pool chlorine- A common term used to describe various forms of chlorine products specifically intended for swimming pool sanitization and maintenance purposes

plaster pools- Swimming pools with a plaster finish on their interior surface. This traditional type of pool construction is known for its smooth texture and durability.

pool chemistry-The study and management of chemical processes occurring in swimming pools to ensure proper water quality, sanitation, and balance.

pool custodian – The individual or team responsible for regularly maintaining and overseeing the operations of a specific swimming pool facility

pool experts – Professionals with specialized knowledge and experience in swimming pool design, construction, maintenance, or repair who provide expert advice or services in these areas.

pool maintenance – Ongoing tasks performed to keep a swimming pool clean, safe, functional, visually appealing etc..

safe swimming pools – Pools that have been properly maintained according to established guidelines ensuring they are free from hazards or conditions that could pose risks to swimmers’ health or safety

above-ground pools- Swimming pools constructed above ground level rather than being built into the ground like conventional in-ground ones. They typically feature walls made from metal frames or reinforced plastic materials.

average pool – A general term referring to typical standard-sized residential inground or above-ground backyard-style pools without any unusual features

backyard pools – Residential outdoor private swimming facilities located within individuals’ homes premises such as gardens , backyards etc…

balance in pools- Achieving optimal levels of chemicals (pH , alkalinity , calcium hardness )to maintain water quality while preventing potential damage such as corrosion , scale formation etc…

element in pool chemistry- Any substance involved directly/indirectly within various chemical reactions happening inside a particular body/container holding aquatic solution .

levels of swimming pool- Specific measurements determining concentrations/amounts present within designated aquatic spaces at any given time e.g pH level 7.2 means acidic condition lower than desired ideal pH level range(7.4-7.6)

calcium levels – Concentrations of dissolved calcium minerals found in swimming pool water, which need to be maintained within proper ranges to avoid scaling or corrosion issues

ideal chlorine levels – Optimal range of free available chlorine (FAC) concentration recommended for effective disinfection and sanitization of swimming pool water while ensuring swimmers’ safety.

level of chlorine- The measured concentration or amount of free available chlorine present in the swimming pool water at any given time.

cyanuric acid levels- The desired range or optimal concentration of cyanuric acid added to the pool water as a stabilizer for maintaining adequate residual chlorine effectiveness.

Alternative sanitizers – Other methods or substances used instead of traditional chlorination techniques for treating and disinfecting swimming pools e.g., bromine, ozone, UV systems etc..

effective sanitizers – Substances that have proven efficacy in killing bacteria, viruses, algae ,fungi etc…and are commonly used as part of regular treatment protocols.

hypochlorite ion – An anionic form resulting from dissociation when sodium hypochlorite is dissolved in water; it acts as an oxidizing agent responsible for destroying microorganisms and organic contaminants present in the pool water

Lithium Hypochlorite- A specific chemical compound commonly used as a fast-dissolving granular form sanitizer alternative to other types like sodium hypochlorite

form of chlorine-The physical state/structure adopted by Chlorine element after being transformed into certain compounds/products during manufacturing processes .

form of chlorine used- Specific type/formulation chosen among various forms such as tablets , granules , liquids etc…to add/present required level/concentration on-site/on-demand within specified aquatic syste

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Mike Hunter

Mike is the owner of the local pool shop. He's been in the business for over 20 years and knows everything there is to know about pools. He's always happy to help his customers with whatever they need, whether it's advice on pool maintenance or choosing the right chemicals. He's also a bit of a pool expert, and is always happy to share his knowledge with anyone who's interested.

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