Cleans and deodorizes with every flush, keeping the bowl sanitary. Kills 99.9% of bacteria. Concentrated, powerful chlorine formula bleaches away stains and keeps water crystal clear. Lasts up to four months. Safe for plumbing and septic systems. 1.25-oz. tablet. 2 tablets per pack; 6 packs (12 tablets) per case. Sold by the case.