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Pool Chemicals 101

Maintaining your pool is easier than you think. Get expert tips on when to test the water, which chemicals you need throughout the season and more below.

Pool Chemicals FAQ

You need water test kits and strips.
These can determine and balance the pH, alkalinity, calcium hardness and stabilizer of your pool water.

You need a pool opening and closing kit.
These kits come with everything you need to get your pool up and running for the season, or closed up for the winter.

You need an algaecide.
Algae can grow on the walls and bottom of your pool and in your pool water after a rainstorm, during cloudy stretches or if your pool isn't properly maintained. If using an algaecide doesn't work, you might not have enough sanitizer, the circulation could be poor or you've got improper filtration.

You need bromine.
Bromine helps to keep your water fresh, clear and safe for swimming. Unlike chlorine, it keeps destroying bacteria at a higher pH range.

You need chlorine.
Chlorine helps to keep your water fresh, clear and safe for swimming.

You need a clarifier.
This will keep your water crystal clear and improve the filtration process in your pool. If using a clarifier doesn't work, check your chlorine/bromine level and pH level.

You need shock.
Treating your pool water with shock once a week helps eliminate waste products, like sunscreen, from the water. When the weather gets warmer and you've got more swimmers, you'll also need to add shock.

You need stain chemicals.
Your water has excessive amounts of iron, manganese or copper that need to be neutralized.

Pool Maintenance Made Easy

Use the Water Test Aquarius® calculator to figure out which chemicals your pool needs.

How-to Guides: Pools

More For Your Pool

Maintaining Your Pool

Maintaining your pool is easier than you think. Get expert tips, chemicals, supplies, accessories, parts, and more.

Pool Opening & Closing Kits

For regular maintenance of your in-ground or above-ground pool, we've got the pool chemical kits you need for opening and closing your pool each season.


Is your pool water turning green? Sanitize your pool from mold and algae with our selection of pool algaecides.

Pool Balancers

Keep the pH level, calcium and other chemicals in your pool at the right level with a pool balancer.


Need to sanitize your pool? We have a wide assortment of pool bromine liquids and tablets.

Pool Chlorine

Available in liquid, tablets, pucks or granules, our pool chlorine disinfectants are the best for regular upkeep or shock treatment of your pool.

Pool Water Clarifiers

Keep your pool water crystal clear and improve the filtration process running smooth with clarifier solutions from top brands including Aquarius Pool and more.

Pool Shocks

Keep your pool in top shape and get rid of algae and bacteria from your pool with pool shock treatments that come in non-chlorine and chlorine varieties.

Pool Test Kits, Strips & Digital Testers

Check and maintain your pool water quality with our selection of pool water test kits, strips and digital testers.