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I have a Hayward DE Filter that has a psi of 4. I've backwashed the pool, taken the filter apart and cleaned the grids, added more DE. The pressure reading is still low. I also replaced the O'Ring on the filter when I took it apart thinking it might have an air leak. Any suggestions?
Michelle
Assuming the normal filter pressure is higher than 4 PSI, it is likely that you have either a clogged impeller or a clogged suction line. The impeller inlet can be check by removing the pump basket. If that is clear you can try to back flush the suction line.
what happens if you close off the return valve to pool ,what does pressure go up to?