Presence of phosphates

Phosphates are present in your pool?


Where do phosphates come from and what to do about it?


Broadly speaking, phosphorus is a simple chemical compound, absolutely essential to life, and represents 2 to 4% of living matter. Phosphates are produced by the oxidation of phosphorus and are among the essential compounds for the survival of living organisms.

Pool water becomes polluted with phosphates. Phosphates are released by all living organisms, and are present in top-up water, rainwater, urine, plant waste, fertilizers used near the swimming pool and even in dust. Over time, phosphates gradually build up in the pool water, especially when it is not often topped up.

Phosphates is the main source of nutrients for algae:

Phosphates are a “fertilizer” for algae and encourage their development, even in the presence of chlorine. And, although some of the phosphates are consumed by the algae, the latter also release some when they die.


To eliminate this problem and maintain chlorine’s maximum efficacy, it is generally considered that the phosphate concentration must be maintained at 100 ppb or less, i.e. 10 g phosphates per 100 m3 water.

If there are phosphates in your pool, use hth® ANTI-PHOSPHATES. A durable and effective solution to eliminate phosphates from your pool water once and for all, and limit algae issues.