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I did a backwash today and when I did the rinse it shot very dirty water back into the pool. Did I do something wrong? Was there an extra valve I was supposed to close? I thought the multiport valve opened and closed all the correct ones.

We have been having some issues with our neighborhood pool. A few weeks ago it became very cloudy and green over the course of 1 or 2 days. Our pool company blamed the issue on water balloons clogging the filters. It took a week and closing the pool to shock it for it to return to normal...