Baracuda pumping dirty water back into pool

For some reason, our pool filter is not pumping the water through the filter. its pumping it right back in the pool as if its by passing the filter. I took the filter unit apart …..and washed the filter ….and checked the piping …and its still pumping it right back in. I have backed washed/cleaned …everything …..i think it could be the O ring thats compromised where the filter sucks the water from the filterunit through the filter and out the outake. what else could it be ??

You didn’t specify what type filter you have. If it is a sand filter- change the sand. This is a common problem with sand filters. If a cartridge filter then carefully examine the cartridge for any tears or frayed spots. Replace if necessary. If a DE filter then you should be getting DE blowing back when you add it. Check the grids and manifolds for holes, cracks.