I live in California with very high tds and unfortunately only have the quarter size Unger hydro power right now for Di. I started doing solar today just 22 panels, was at 1 tds at the start came down from the roof and it was over 100 already. There wasn’t any spotting however that I could see when I went back up and inspected the panels. Should I re do this customers panels? Is there an industry standard for tds when cleaning solar panels?