Poly-Brite Filter Tabs are not your average clarifier. Compatible with sand, diatomaceous earth, and cartridge filter systems. Permits filter to remove organic and inorganic impurities providing ?polished? water clarity. Works in as little as 12 hours and leaves no floc to be vacuumed. Can be applied through the skimmer, gutter, pump pot, surge pit or off-line feeder. Reduces amount of sanitizer consumed by physically removing organic and inorganic material. 1.5 pounds of Poly-BriteTM will provide up to 5 treatments on a 30,000 gallon pool or 1 treatment on a 150,000 gallon pool. Easy to handle and store 1.5 lb. bottles. The tablets do not support combustion or generate any hazardous fumes.