More than likely a broken, loose or cracked lateral in the botton of the filter. Yes, under all the sand. First check you backwash valve to make sure it is all the way in the filter position or if a push-pull type, all the way up...
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More than likely a broken, loose or cracked lateral in the botton of the filter. Yes, under all the sand. First check you backwash valve to make sure it is all the way in the filter position or if a push-pull type, all the way up...