Leslie's Pool Supplies | Pool Chemicals & Water Treatment (2024)

Pool Chemicals - More Information

Balancing your pool and spa water is one of the most important aspects of being a pool owner. Maintaining proper water balance ensures that the bathers and swimmers in your pool or spa are being protected from bacteria, microorganisms, pathogens, and protozoa that can potentially cause harm to those that are using the pool or spa area. Below is a list of the elements of water that should be tested regularly.

  • Free Available Chlorine - Free available chlorine represents the amount of chlorine that is capable of sanitizing.
  • Total Available Chlorine - Total available chlorine represents the combined amounts of free available chlorine and combined available chlorine.
  • pH - pH is the measure of how acidic or basic the water is.
  • Alkalinity - Total alkalinity is the buffer for the resistance to change for the pH in the water.
  • Calcium Hardness - Calcium hardness is the amount of calcium that is in the water. Too high or low levels can lead to adverse effects.
  • Cyanuric Acid - Cyanuric Acid often referred to as conditioner or stabilizer, is a chlorine protectant, designed to protect the chlorine molecules in your pool from the harmful effects of UVA and UVB rays. To put it simply, cyanuric acid acts as a sunscreen for your chlorine. Iron - Iron is an element commonly found in fertilizers. Having too high of an iron level can cause staining and severe discoloration of surfaces in the pool.
  • Copper - Copper is an element commonly found in certain algaecides and heat exchangers. When copper is present in the water, it makes the non-living organic material in the water more susceptible to chlorine sanitization. Having too high of a copper level can cause staining and severe discoloration of surfaces in the pool.
  • Phosphates - Phosphates are a nutrient source for algae. Maintaining a low phosphate level ensures a low probability of algae blooms.
  • Total Dissolved Solids - Total dissolved solids refers to the measure of the amount of chemical and other outside variables dissolved in the water.

To test the above elements, you can use either test strips, a droplet reagent kit, or a water testing device. Once the water is tested, it’s important to take note where the water balance needs to be adjusted and then make the adjustments by using the correct pool chemicals. Below is a brief description of the main chemicals used to treat pool water.


Chlorine Tablets are designed to maintain chlorine residual for proper sanitization of the water. Comes in 3” and 1” tablet sizes for a variety of applications. Pool Chlorine Tablets are the most commonly used primary sanitizer on the market. Chlorine tablets slowly dissolve and kill viruses, bacteria, and control algae, making them one of the easiest and most effective methods available.

Pool Shock

There are three types of Pool Shock that we have available to quickly treat and maintain the chlorine sanitizing level in pools and spas.

  • Calcium Hypochlorite Shock — Leslie’s Power Powder
  • Sodium Dichlor Granular Chlorine Shock — Leslie’s Chlor Brite
  • Chlorine Free Oxidizing Shock — Leslie’s Fresh ‘N Clear

Bromine is an alternative sanitizer used in spas and hot tubs. Bromine doesn’t require stabilization which means it's better suited for hot and warm water environments.

Water Balancers

Water Balancers are used to raise and lower pH, Alkalinity, Calcium Hardness, and Cyanuric Acid.

Natural Chemistry

Natural Chemistry a wide range of products from phosphate removers, enzymes, sequestering agents, chelating agents, and many more. Some of the more popular products include Pool Perfect, Pool Perfect + Phosfree, Metal Free, and Instant Conditioner.

Alternative Sanitizers

There are other alternatives pool sanitizers available to use instead of chlorine tablets in pools and spas. UV and mineral sanitizing systems are effective at sanitizing the water while reducing the amount of chlorine that is normally required.

Specialty Pool Chemicals

Specialty chemicals include clarifiers, algaecides, phosphate removers, stain removers, cleaning chemicals, and more.

Algae Control

Pool Algaecides and algae control chemicals are designed to make algae more susceptible for chlorine to sanitize it out of the water.

Pool Chemical Kits

Our kits and bundles are designed to open and close pools and spas of various volumes of water easily.

Water Test Kits

Regular water testing is an essential part of maintaining your pool’s welfare. Getting an accurate reading of your water chemistry helps you understand exactly how much of what product your pool needs. Testing your pool water prevents the possibility of under-treating or over-treating the water, which keeps your pool properly balanced and saves you money!

Learn More About Pool Chemicals and Water Chemistry
  • Pool Chemistry 101
  • How to Balance Pool Water
  • How to Clear Cloudy Pool Water
Leslie's Pool Supplies | Pool Chemicals & Water Treatment (2024)


What pool chemicals should not be added at the same time? ›

With the exception of salt, you should never mix any types of chemicals and put them together, not even close to each other. Never want to mix acid with chemicals like stabilisers, chlorine and buffers. Salt can be added with acid.

What is the best shock at Leslie's? ›

Leslie's Power Powder Plus 73, a powerful calcium hypochlorite shock, is our most popular chlorine pool shock, and for good reason: it effectively gets the job done so you can return to the water faster.

What pool chemicals should I add first? ›

The Right Order to Add Pool Chemicals
  • Add Alkalinity Adjuster. The first thing you need to do while adding pool chemicals in order is to balance the water's alkalinity. ...
  • Bring in a pH Adjuster. The next order to add pool chemicals entails balancing the pH level. ...
  • Manage Calcium Hardness.
Dec 5, 2023

How many times a week should you put chemicals in your pool? ›

You should aim to keep the chlorine level at between 1 and 3 ppm. We suggest shocking the pool every week to two weeks; with hot weather or increased use, you may need to shock more often. When tabs run out, replace them.

What chemical can ruin a pool? ›

High Stabiliser + High Chlorine Levels

These pool chemistry combinations are some of the worst that can happen to your pool, so don't forget our mantra here at Mr Pool Man, test, test, and test your water!

What is the golden rule when using pool water chemicals? ›

The simplest strategy is to follow them, remembering the two golden rules of adding chemicals: only add chemicals to a pool that is running, and only add chemicals to water, not water to chemicals.

What's the difference between shock and chlorine? ›

Liquid chlorine and granular shock have the same active chemical that sanitizes your pool, what changes is the strength and the way you use it. Liquid chlorine is less costly, unstabilized and comes in liquid form. Granular shock is stabilized and comes in a solid form that dissolves in your pool.

Can you add too much shock to a pool? ›

The simple answer is yes, you can over shock a pool. This is when the chlorine level in the water becomes too high and can be harmful to swimmers. When you shock your pool, you are raising the chlorine level to 10 times its normal level. This is done to kill off any bacteria or algae that may be present in your pool.

How many bags of shock should I put in my pool? ›

If the water looks good and you simply want to boost the chlorine level a bit, add 1 bag per 20,000 gallons. If the water is hazy or cloudy, use a full bag per 10,000 gallons. Or, if there is algae, use 2–6 lbs per 10,000 gallons, depending on the extent of the algae bloom.

Can I add all my pool chemicals at once? ›

You should not add certain pool cleaning chemicals simultaneously because they can react and cause dangerous chemical reactions.

Should you backwash pool before or after adding chemicals? ›

It's important to remember that you should wait to add chemicals to the swimming pool until after you've backwashed as the process will dispose of some existing water in the pool. Think of backwashing your filter as emptying your vacuum cleaner's canister or bag.

In what order do you balance pool chemicals? ›

To chemically balance your swimming pool water, follow these eight steps:
  1. Adjust Alkalinity. A pool with low alkalinity has high acidity. ...
  2. Adjust pH Levels. ...
  3. Balance Calcium Hardness. ...
  4. Sanitize. ...
  5. Measure Cyanuric Acid (CYA) Levels. ...
  6. Measure Dissolved Solids. ...
  7. Shock the Pool. ...
  8. Test the Water.

Do you leave a chlorine floater in the pool all the time? ›

If you've got a floating dispenser, remove it before swimming. The chlorine levels around it could be higher and irritate swimmers. Also, it could be used as a toy by children or dogs.

What happens if you put too much chemicals in pool? ›

Excessive chemical levels in the water can potentially lead to various health issues, including skin and eye irritation, as well as respiratory problems. Taking precautionary measures and refraining from swimming will help ensure the well-being and safety of individuals.

Do you add algaecide or shock first? ›

Algaecide should be added after every shock treatment.

How long to wait before adding different pool chemicals? ›

Try to wait at least 10 minutes between adding chemicals to your pool. This is a sufficient amount of time for the chemicals to mix in the water.

Can I add all pool chemicals at once? ›

You should not add certain pool cleaning chemicals simultaneously because they can react and cause dangerous chemical reactions.

Which pool chemicals are incompatible? ›

Incompatible Pool Chemicals

Mixing of organic chlorinating agents (such as trichloroisocyanuric acid) and inorganic chlorinating agents (such as sodium hypochlorite) can lead to fires, explosions and chlorine gas release.

Is it okay to add shock and algaecide at the same time? ›

It is critical to understand that using pool shock and algaecide together can cause bad chemical reactions if the necessary precautions are not taken. Since your chlorine levels will not return to normal right after you shock your pool, we recommend waiting at least 24 hours to add algaecide.

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