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I've attached a picture of my system. I want to understand how it works. I'm somewhat technical and should be able to catch on. I'm having some problems and want to understand what my PB is doing and why. We just replastered and he started it back up this week. It was running in service mode...

I have a pool plaster problem. There are greyish/brownish mottled areas--your posting that talked about "hydration" problems sound similar but I'm not sure . I've uploaded a picture and hope for some opinions on what my problem is. I have 20,000 gal chlorine pool with pebble tec that is 10...