GLB Pool & Spa Products 71500 24000-Gallon Winter Pool Closing System Algimycin winter algaecide is an EPA registered, non-foaming, non-metallic winter algaecide that keeps pools algae-free all winter Oxy-brite chlorine free shock treatment oxidizes organic contaminants that cause odors, cloudy water, skin and eye irritation Sequa-sol sequestering agent holds iron, manganese, copper and calcium in solution so these minerals do not react with other elements in the water Contains everything you need to close your pool; makes spring pool opening hassle-free compatible with ozone, chlorine and bromine sanitizers Measures 10.1-inches in length by 3-inches in width by 2.7-inches in height