HOW DO I KNOW IF THERE ARE PHOSPHATES?
Phosphates are in tap water, pools, several cleaning products such as detergents. etc.
It's important to remove phosphates in pools because that is what algea feeds on.
Algicides will help control or kill algae, but will not affect phosphates, however phosphate removal will affect algae directly.
A test to determine how much phosphate is the first step, then the appropriate product.
A quantity of phosphate removal product can be used on a weekly basis, replacing an algicide and is a more eco friendly solution.