You have a problem ... Can you see the little tube that bleeds air out of the return pipe? If not ... see if you can find it and get it to the top of the filter. Still have sand? You may have a cracked lateral ... remove the sand and check all the laterals. Replace any that are broken. When you refill the sand ... be sure to put water in first to soften the beating the laterals take from the falling sand.
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You have a problem ...
Can you see the little tube that bleeds air out of the return pipe? If not ... see if you can find it and get it to the top of the filter.
Still have sand? You may have a cracked lateral ... remove the sand and check all the laterals. Replace any that are broken.
When you refill the sand ... be sure to put water in first to soften the beating the laterals take from the falling sand.