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I had the same month problem, open up your multiport valve, its only a few screws , inside is rubber washer which deteriorates easily and my valve was cracked. The new one now correctly closes the ports to the setting you want and prevents the dirty water and filter media from being blown back...

Shot in the dark but do you have a multi port valve before the water goes into the filter? This is the part with the handle , you can change to backwash, filter ect. If you do check it to make sure the rubber gasket is not shredded and the valves aren't broken. I had one and couldn't figure it...

I don't re bee the demensions but it's in ground, about 35 feet long and 20 feet wide. Just estimates. Deep end is 12 feet. This summer a new liner was put in, concrete was dug up and all new lines were ran to all the outlets and skimmer. I have a Hayward earth de filter, with brand new...