Patent ID: 8663496

Claim:
A compacted solid product for the purification of water comprising at least one first layer and at least one second layer, wherein the first layer comprises at least one flocculating system and at least one disintegrating system, the second layer comprises at least one disinfectant which releases active chlorine on contact with water and at least one excipient for the disinfectant, the excipient releasing the disinfectant into the water at a controlled rate such that the excipient-disinfectant combination releases from 0.1 to 100 mg/l of active chlorine per hour, the flocculating system comprises at least one trivalent metal salt and at least one water-soluble cationic polymer, and the at least one water-soluble cationic polymer is present in a volume of water to be treated at a content ranging from 1 to 2 ppm.