Natural Chemistry's PhosFree is a perfect cost savings way to reduce phosphate levels in your pool by combining two great products. The added benefits include reducing sanitizer demand, maintaining low levels of phosphates, prevents scum lines, and surface oils. PhosFree reduces phosphates to near zero which will allow you to enjoy an algae free pool! Features: No phosphate build-up Less vacuuming Reduced filter maintenance Less cleaning time means more pool enjoyment Enhances any sanitizer program