I am a new pool owner (not a new set up, we bought a house with pool) and I have been stalking this site since before I opened the pool! So glad I found you guys! Here's my problem: I had my pool professionally "opened" on April 23. All was well until about 5 or six days after that I noticed my white stairs had brown discoloring and so did the liner. I did some research and did the Vit C tab test and it was definitely metal staining. I bought the Metal Magic and the sequestering agent and all stains magically disappeared within 18 hours. 5 days later they are slowing coming back! Before the first go round of staining my ph was a little out of whack, but that was it. I had my water tested by the pool store when I noticed the second round of stains forming and here's what I got:
Free Chlorine 6.2
Total Chlorine 6.2
Cyanuric Acid 129
I know my chlorine was high, that's because my pool guy told me to fill my automatic chlorinator up with the tabs and I have since stopped using it and just put the tab in the strainer basket. It seems to be in perfect range (per the cheapo testing strips, I am going to order a good kit you recommend). When I treated for stains I added 2lbs of metal magic and a bottle of the sequestering agent. I fill my pool with city water which tested 0 for Copper and Iron. Whatcha guys think? Why do they keep coming back?! Am I going to have to do the treatment every 5 days for the whole summer?