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    Rainbow 320 - either under chlorinates or over chlorinates

    I have a Rainbow 320, IG vinyl pool, 15,500 gallons with a VS pump I keep 24/7 at 2100. I use the BBB method and all is great. But when I go out of town, I use the Rainbow 320 chlorinator. When we went out of town this summer for 1 mth, I started using the chlorinator 2 weeks prior. I do...