Kem-Tek 013 Pool and Spa All-in-One Concentrated Chlorinating Granules, 22-1/2-Pound For everyday pool sanitization and super chlorination Super concentrated formula goes 3 times farther than calcium based products Stabilized to reduce chlorine loss to the sun's UV rays Will not cloud water raise ph or create calcium deposits on tile Leaves no chalky residue on pool bottom For everyday pool sanitization and super chlorination Stabilized to reduce chlorine loss to the sun's UV rays Will not cloud water raise ph or create calcium deposits on tile Leaves no chalky residue on pool bottom