I am new to using the TFP method, and I just had a question about my pool experience from last year. I didn't know about this website until mid-season, so I wasn't following the guidelines. I was fortunate in that I had no algae or water cloudiness. However, I noticed that the plaster in my spa seems to have eroded considerably. It was very smooth, but I realized that by August it had become extremely rough. It appears that the top layer was stripped away, and I'm surprised that this could happen so quickly. I am going to have it re-plastered next year, but I am just wondering if it had something to do with the water chemistry. The pool, for whatever reason, does not appear to have been affected.
I have a 35,000 gallon plaster pool with a SWG and Nature2. This was the chemistry throughout the season: 3.0 FC, 40 CYA, 7.6 PH, 260 CH, 60 TA, 3.4 PPM Salt
Can someone explain those results to me? Would anything there have caused plaster issues? What is the significance of the 3.0 FC with the 40 CYA? I now realize that the CA should have been at least 70. Should I have had only 2 PPM in FC, since the CYA was so low? Could the lower CH also have been an issue?
I appreciate any insight!