Brand: Horizon Features: Helps eliminate scum line from body oils, lotions and make-up in your pool or spa Increases time between cleanings Specialty patented foam absorbs 43 times its weight in oils / lotions Includes 2 Scum Balls per pack Prolongs pool/spa filter life by eliminating scum before it forms Details: Scum Balls float in your pool or spa to help prevent the formation of scum lines and reduce foaming. Simply place the Scum Ball into a clean pool or spa to absorb more than 40 times its weight in body oils and lotions. Just float the scum remover in your pool or spa for about 30 days, or until saturated, then clean and reuse.