Long-Lasting 1 inch Chlorinating Tabs are slow dissolving but fast-acting and used to chlorinate and disinfect pools on a continuous basis. The Chlorinating Tablets fit perfectly in most chemical feeders but can also be added to a dispenser, skimmer or automatic chlorinator. tablets are specially constructed to erode at a slow rate which provides constant chlorination, increased clarity and tremendous value. These tablets are formulated with 90% available chlorine and are among the strongest available on the market today. Tabs utilize a built-in UV inhibitor that protects the chlorine in your pool against the harsh sun rays that same active UV-inhibitor blocks the sun rays to ensure longer lasting sanitation in your swimming pool. tablets are great for all pool types large or small including vinyl-lined pools and even those with saltwater systems.