Probably, a blown out or damaged multi-port gasket
#10 on image below:
I backwashed due to alot of rain. When I tried to put the valve back in filter, it is still disharging to the backwash.
I wanted to take the valve apart and was looking for advice.
It is on a pentair tritonII commercial filter with crushed glass. The valve is model SM 20-3, valve assembly SM2-PP2 and it is a couple years old.
Probably, a blown out or damaged multi-port gasket
#10 on image below:
PoolDoc / Ben
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