Every morning my robot cleans the pool. My filter runs 8 hours over night. In the morning the dirt is back.
We’d be glad to assist you. What is the make and model of your filter?
Hayward DE3600
The likely cause of dirt returning to the pool would either be holes in the de grids, a crack in the manifold, or a bad standpipe o-ring.
A rare possibility would be a cracked pipe underground. I’d focus on the filter before looking at other causes.
The grid’s abd manifold were changed in june. Not sure about the o ring
If you have a multiport filter valve, the spider gasket can go bad. Some pool owners have traced their debris issue to the spider gasket.
I will check that next. Thank you
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