"Great shock - you can use in the morning before swimmers arrive and it will dissolve and is ready to go before lunch.
Great product and great service from In The Swim as always."... (read full reviews)
"I tried this product for the first time this year and I've decided that it's the best shock on the market! I have a gunite pool(circa 1968) and I have battled every kind of algae known to mankind,"... (read full reviews)