... , 20g tablet, 200g tablet, stick. 3,Pool Chemical, Water Treatment Chemical TRICHLOROISOCYANURIC ACID--TCCA (Pool Chemical, Water Treatment Chemical)( Powder, Granular, 1 ... .5% min2.7- 2.9 Usage:Used as biocide in swimming pool, industrial cycling water, dringking water; Sterilzing agent in hospital, public ...