United ChemicalsYellow Treat®The best and most trusted yellow algae removal product. * The Original and still most effective yellow/mustard algae treatment in the world today * Yellow Treat is a non-toxic algicide and can be used in pools and spas * Contains Zeos, which will add a sparkle or polish to your pool * Hottest formula in California & Florida, the 2 toughest areas in the world * Safe for you & your pets * Comes in powder form * 5 ozs treats 10,000 gallons