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I know my Dolphin manual states 4 ppm max. Does anyone actually follow this? Seems rather low?

Test Sig

I have a Pentair/Hayward setup with sand filter. Thinking about adding a timer to my setup to run pump when needed. My question is when pump is turned off manually now, it loses its prime and when turned back on shoots dirty water back into pool. I guess when its losing prime its disturbing the...