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