I have a pebbletec pool, with what I believe is a flagstone border at the top edge. It appears as if the flagstone is chipping off and decaying -- I even found a quarter size chip of it in my pool vacuum.
I'm going to assume this has to do something with CH as my pH is usually around 7.6 sometime as high as 7.8. CH is around 200.
Can someone confirm my theory? I plan on raising my CH to around 250.
SWG Pool, 13,500 Gallons.