Not broken or stopped up -- it usually means 1 of 2 things:
1. Most of your sand is missing, or
2. Your pump is too big for your filter.
Often it's both - having a an oversized pump will blow sand out of the filter on each backwash. This is a very common problem on AG pools. The short term solution is probably to open the filter and add sand. The longer term solution is to get a bigger filter OR to get a smaller pump OR to rework your existing pump with a new impeller so that it acts a smaller pump
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