I found this product on the web, and it keeps our pool GREAT looking. Its called Simply Blue. It is compared to Pristine blue but its only 19 dollers a bottel and lastest almost a full year!!!! pristine blue last maby a month and it 40 + dollers. I found this product on simplybluepools.com!! its EPA approved and is shipped as soon as its ordered. I think everyone should try it and live in a chlorine free world haha. It doesnt evaporate out your water either and chlorine cant say that.