Well, I may have bought the wrong thing. K-mart is selling 96oz bottles bleach for $1.00. That's about the best price I have seen for a while. So I went to check it out. The first thing I noticed is that the label doesn't give the percentage of sodium hypochlorite. In the past, I stay from the procuct. This time, I'd give it a try. My plan is/was to test the FC and treat the entry in the Pool Calculator as 6%. I would add the amount recommended then test the water an hour later to see if I reached the target level. If it didn't, I'd adjust accordingly.
So I bought three cases and came home. While unloading the boxes, I noticed the box had printed on it "ingrediants-water 7732-18-5: sodium hypochlorite 7681-52-9: sodium hydroxide 1310-73-2. (I just included the numbers because they were there.) I know that sodium hypochlorite is chlorine. I googled sodium hydroxide and found that it's also known as lye and caustic soda. Will the sodium hydroxide hurt my pool?