Swimming Pool Tips

Swimming Pool Information

Will Chlorine Kill Algae In A Swimming Pool?

Normally Yes. Chlorine kills algae and bacteria by a chemical action called oxidation.

Why Is Chlorine Used In Swimming Pools?

Chlorine is used in swimming pools to act as a disinfectant and to stop the growth of algae.
Without chlorine, most pools would be green within a few days.
It takes chorine or non-chlorine shock to kill algae. An algaecide is usually used in conjunction with a chlorine shock to kill algae.

Chlorine helps pools by killing off the algae microorganisms. It also helps in keeping down the growth of algae.


Warm pool water and chlorine levels below 1 ppm contribute to algae growth. If there is a high concentration of phosphates in a swimming pool, you can get algae growth even if the chlorine level is higher than 1 ppm.

What Causes Algae In A Swimming Pool?

The lack of proper swimming pool water filtration and when chlorine levels have been allowed to drop too low. Or when the chlorine is not acting effectively because the water is out of balance, or the pool water has high levels of stabilizer (cyanuric acid). Hot and humid sun conditions as well as if the pool has been used a lot for swimming.

Algae are spores that are blown into the pool or carried into the water in other ways, They then multiply into blooms when the conditions are ideal for them.

Algae are spores that are blown into the pool or carried into the water in other ways, They then multiply into blooms when the conditions are ideal for them.

These tiny microscopic plants feed on nutrients in swimming pool water.