I was in Walmart and first went to the household bleach section. Great value brand seemed the cheapest but I notice some had the actual chlorine content and some of them didn't. Hard to tell what other additives they are putting in this stuff since its not listed. Obviously avoid scented etc but beyond that I'm concerned about what else they are putting in this stuff since it certainly isn't being marketed for pool use. I went over the to pool section and ended up buying a box, two gallons, of HTH brand liquid chlorine 10%.