Thanks to all! I added chlorine and will continue to test to see how much more I need. I will have to get to the store to buy stabilizer and I don't think they will be open tomorrow so it will probably be Monday before I can get it. Can I go ahead and add 1 qt. of muriatic acid now to bring down the PH at the same time I'm trying to raise my Chlorine Level? By the way: My Cal. was 120-140 (I wasn't sure which shade of blue to look for?). Is that bad or good?