Microbe-Lift Phosphate RemoverMicrobe Lift Pond Phosphate Remover is a polymeric blend that ties up large quantities of phosphate without impacting your pond water negatively. This product safely removes phosphate, which is caused by the decomposition of leftover food, fish excretion, and dead plant matter. Phosphate remover keeps your pond water at safe phosphate levels, which is below 0. 3 ppm in fresh water. Safely removes phosphate Doesn't negatively impact pond water