Stabilized Chlorinating Tablets are a slow dissolving product that releases sufficient chlorine to reduce the growth of harmful algae and micro-organisms in your pool. This product needs no filters and has 90% available chlorine. It is slow eroding, which makes it effective for use in plastic skimmers, automatic chlorinators, or floaters. This product also has a long shelf life. This effective stabilized disinfecting agent will safely kill harmful bacteria in your pool.