SHOK ULTRA 3 IN 1 6oo gram pkgs. Box of 12
BOX OF 12 600 gram bags Use SHOK ULTRA 3 IN 1 weekly to keep water crystal clear. Maintain daily levels identified in the directions for use of the swimming pool sanitizer being used, as determined by testing kit. SHOK ULTRA 3 IN 1 actively destroys the organic residue in your pool water.