Devours scum, slime, and grime in your pool or spa. Absorbs 40 times its weight in body oils and suntan lotions - even pollens. Place "The SCUMBALL" in your pool skimmer (fits all types) or free float it in your spa. It is round so no need to flip over. When saturated, squeeze out, clean and reuse. Improves filtration and when placed in a clean pool or spa. "The SCUMBALL" helps to eliminate the formation of a scumline. Under normal conditions, "The SCUMBALL" should last an average swimming season or 3 months in a spa.