I used to get the cal hypo from Walmart, but it looks like this 50 lb bucket is unstabilized (good) and a significantly better deal! Confirm/deny?
Introducing Pool and Spa's Cal-Hypo Super Strength Pro Pool Shock. This pool shock quickly dissolves in your swimming pool to get rid of any bacteria, algae, or contaminants. Shocking your water is necessary to keep your pool clean by ridding it of unwanted contaminants.