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.. See full description for further details