Learn About Pool Water Chemistry

Maintaining a proper chemical balance is essential to making sure your pool stays clean, safe, and comfortable.

Seasonal offers free in-store water testing to help you keep your pool water clear and trouble-free.

Learn what we test for, and what it means for your pool!

Sanitizers

Baquacil

Baquacil sanitizer and algistat is an easy, gentle, and effective way to kill germs and control algae.

Chlorine

Chlorine is the most commonly used disinfectant for swimming pools. We recommend the easy and effective poolife NST system.

pH

pH is a measure of the relative acidity or basicity of pool water. pH is the single most important factor in swimming pool water chemistry. It affects every other chemical balance in pool water.

Total Alkalinity

Total alkalinity is a measure of water's resistance to change in pH.

Cyanuric Acid

Proper stabilization with cyanuric acid protects chlorine levels by slowing the rate of chlorine dissipation.

Calcium Hardness

Calcium hardness is a measure of the dissolved calcium salts in water. The proper level is between 180 and 250 ppm.

Copper & Iron

Dissolved metals can commonly appear in pool water. They may be brought with tap water when you fill your pool, or they may appear as metal fittings and parts in your pool slowly dissolve.