Phosclear Buffered Alum Powder Pond Water Clarifier Use PHOSCLEAR to keep ponds clean and clear! Effective treatment to control and improve water clarity! Environmentally Safe! It is designed to clear brown and green water by effectively removing phosphorous and suspended particulate matter from the water column without the hassle or mess of traditional alum treatments. Phosclear is an environmentally safe product that reacts in the water and sinks to the pond bottom where it binds phosphorous into an insoluble form.