ok, pool is filling. Do not have the test kit from Amazon yet, but have the 3 part tester from walmart and will be testing (when filled?) another question, a friend of mine used to have an Intex (maybe the Summer one) pool and he bought something called Star Shock. Ingredients is 12.5% sodium hypochlorite and 87.5% other ingredients. He is offering two gallons to me. Is this something that would be useful to me or is it going to sit in my shed as I try to figure out what to do with dangerous chemicals.