HTH, 32 OZ, Filter Cleaner, Is A Non-Corrosive Filter Cleaner & Backwash Aid, Designed To Improve Your Filters Efficiency By Removing Dirt, Lotions, Body Oils, Insects, Leaves, & Other Pool Contaminants, A Dye Free & Fragrance Free Proprietary Blend Of Proteins & Surfactants, Cleaning Your Filter On A Routine Basis Helps Your Filtration System Work More Efficiently & Extends The Life Of Your Filter.