danomite

Thanks for your help. The muriatic acid I added is a little like ascorbic acid, except it's not as fast, and could not work as well. Fortunately for me, it did the trick. I also raised my pH slowly, but the stains came back 4 days later and adding more metal treatment no longer helps. Maybe my pH needs to be dropped to add more metal treatment? Does anyone know why my pH reading is so different from the store's reading? Thanks a lot for the help.

I've only been a pool owner for 2 years now (this summer will be the 3rd summer), and i am having trouble with my fiberglass pool. Last year, i started noticing stains around the steps and the return and especially in the spa area. This year, I emptied the pool and refilled to when opening, since i thought it would help. When i started adding chlorine, the stains got 10 times worse. The whole bottom of the pool was stained. So I put in some muriatic acid, waited 24 hours, and everything came beautiful except for a few spots. Then I added a metal treatment, and the rest of the spots disappeared, and the pool has never been whiter! I kept cleaning the pool while bringing the pH value back up, and 4 days later, the bottom started showing the stains everywhere as before. The spa as well. I added more metal treatment, and the spa came clean, but the floor is still completely stained. So Im really at a loss, because I read a few posts that if cought early enough, when putting more metal treatment, the stains should go away. Not in my case... Now, here is a question: My little test kit tests for chlorine and pH. The problem is, while adding pH+, my test would always show a pH value of about 6.8 I got my water tested at the store, and the pH is at 7.6 and alkalinity is at 50. So could that be causing my pH test to always show 6.8? I've started adding alka+ now to bring up the alkalinity. Should I bring down my pH and try adding more metal treatment? One more thing to note is that the floor has staining throughout, except in the middle. In the middle, there is a clean line that runs from one end of the pool to the other in a straight line where the bottom drain is. Do you think I simply have a bad circulation problem? Is there something I can do? I don't want to invest in expensive equipment if it won't help. Also, my source water has been tested and has no metals in it. What could be causing all these problems? I have a lot of earth and grass that flies into the pool at the beginning of the season, and sand from the pave around the pool falls into the sand as well. Can this be it? When i had the stains gone, the pool looked better than when i had it first installed, so I really hope I can get it to look like that again and for good. I hope you can help me. Thank you very much!