DryTec 1-1901 Calcium Hypochlorite Chlorinating Shock Treatment for Swimming Pools John Merkel 7 years ago Zappit 73% Cal Hypo Pool Shock – Calcium Hypochlorite Super Shock 50lbDateNovember 10, 2016In relation toSimilar postDryTec Extra Shock Treatment for Swimming Pool Chlorine BagDateNovember 10, 2016In relation toSimilar postIn The Swim Chlorine Pool Shock – 24 X 1 lb. bagsDateNovember 10, 2016In relation toSimilar post