I went to Leslies today to take a water sample ( still dont have test kit yet). Well I have been using bleach for about a month and I just purchased 12 LB's of shock from Leslies before my bleach started. Anyway I asked the lady if she would take back my powdered shock at least for store credit and she said YES. ($60.00 )Then as I new it was coming she finally ASKED WHY? I told her I wanted to use bleach and she just said if I mix one third of the bag of shock with a gallon of water I had the same thing.Well I took the store credit and she did not give me a hard time at all.