Chlor-Nix drops chlorine levels in just minutes. Fast action means that stain treatments like Multi-Stain Remover can be used without lengthy delays, and bathers can re-enter pools quickly after a shock treatment. This crystal formula is concentrated; use just two ounces (about two capfuls) to reduce chlorine by 1ppm in 15,000 gallons of water. Our wide-mouth 1 lb. bottle fits comfortably in your hand for easy dosing directly into the water.