Where do phosphates in pool water come from?
In general, phosphorus is a simple chemical element that is absolutely essential to life and accounts for 2 to 4% of living matter. Phosphates, which result from the oxidation of phosphorus, are among the essential components required for the survival of living organisms.
Phosphates come from:
- from all living organisms,
- from make-up water,
- from rain,
- from urine,
- from plant debris,
- from fertilisers used near the pool,
- and even from dust.
Over time, phosphates can accumulate in pool water, especially if little fresh water is added.
Phosphates, the main nutrients for algae:
Phosphates act as a “fertiliser” for algae, promoting their growth even in the presence of chlorine. And although part of them is consumed by algae, they are released back into the water when the algae die.

To eliminate this problem and maintain maximum chlorine efficiency, it is generally recommended to keep phosphate levels at or below 100 ppb, which corresponds to 10 g of phosphates per 100 m³ of water.
How can phosphates be removed?
Check your pool water to determine whether phosphates are present.
Rapid algae growth and green water can be a sign of phosphate presence.
If there are phosphates in your pool, use HTH ANTI-PHOSPHATES. A long-lasting and effective solution to permanently remove phosphates from your pool water and limit algae problems.

To summarise:
Phosphates in pool water promote algae growth and make the water cloudy. They also increase pH instability and quickly consume disinfectants. Remember to check phosphate levels regularly and treat them if necessary.