Hmm. I use regular tap water for my pool, but there was some staining of the liner as my pool builder used table salt for the SWG and I understand that has iron in it. As I added salt as needed during the summer I used solar salt.
I am bringing my water to the dealer for a final test before closing. I'll be sure to have the iron tested. They usually only test for copper-which last test was 0.1.
Thanks for the info. Maui huh? Tough job! But I guess when it is work-it's work!