Phosphate Removal Calculator
High phosphate levels act as fertilizer for algae. Keep them low for a crystal clear pool.
Levels Optimal
No treatment required currently.
Phosphate Facts
0-100 ppb: Ideal. This level is too low to support significant algae growth, allowing your chlorine to work efficiently.
300-500 ppb: Warning Zone. Algae has enough food to bloom rapidly if chlorine drops even slightly, especially after rain.
1000+ ppb: Critical. Algae will often grow even in the presence of chlorine (chlorine demand). You must remove phosphates to regain control.
Optimal Efficiency
Phosphate removers (Lanthanum Chloride) work best in warm water. Below 65°F, the reaction slows significantly. If closing the pool, treat whilst the water is still warm.
Filter Care
As the remover works, it creates a white precipitate (cloudiness) that can rapidly clog your filter. Watch your pressure gauge closely and backwash/clean the filter as soon as pressure rises by 8-10 psi.
Environmental Sources
Phosphates enter via windblown soil, fertilizers, decaying leaves, bird droppings, and even tap water. Without regular removal or prevention, levels naturally rise over time.