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Thread: Started pool - filter pressure remains too high

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    Splinters's Avatar
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    Started pool - filter pressure remains too high

    Two weeks ago I fired up the pool like I've always done. Got most of the leaves out with the net to the point where I could run the robot. I typically do not add DE right at opening because I know that I'm going to pull the grids and hose them off after the water looks clean. Filter gauge was showing about 20 psi at start up which is normal. Yesterday the pool is clean and looking good and the grid pressure is reading 34 psi so it's time to pull the grids. I do so and hose off some really foul smelling worm remains, clean out the strainer basket and reinstall the grids (which looked pretty good). Pressure goes right back up to 30 - 32 psi.

    I've done this before and never had an issue getting the pressure back into the low 20's. So I yanked the grids again and hosed them off more thoroughly with a better hose fitting. Reinstalled the grids and get the same thing. What am I doing wrong?
    35,000 gallon Anthony & Sylvan, plaster over concrete, Purex Triton FNSP 60 filter with DE, 2 hp pump, Nature2 clearvision system, Polaris robot.

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    Mod Squad jblizzle's Avatar
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    Re: Started pool - filter pressure remains too high

    You should never run a DE filter with no DE in it. That can clog up the grids with debris and ruin them.
    Are you sure the valves after the pump/filter are in the same position they were last year? No plumbing difference?

    They may need a deep cleaning at this point ... or to be replaced. See: http://www.troublefreepool.com/use-a...ers-t4086.html
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    JasonLion's Avatar
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    Re: Started pool - filter pressure remains too high

    One likely possibility is that the gauge is broken. Check the return pressure and see if the return jet feels as strong as usual, if so it is probably a bad gauge.

    Another possibility, less likely but basically what jblizzle is saying, is that the grids have gotten too much debris stuck in them that won't hose off. This can usually be fixed by soaking them overnight in a solution of one cup of automatic dishwasher detergent for every five gallons of water.

    Yet another possibility is that some valve on the return side is closed when it should be open, blocking water flow. The returns will be weaker than usual if this is the case.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Mod Squad jblizzle's Avatar
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    Re: Started pool - filter pressure remains too high

    Ah yes, the obvious suggestion of a broken gauge that I overlooked
    Jason, TFP Moderator
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    Splinters's Avatar
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    Re: Started pool - filter pressure remains too high

    I'm thinking that Jason might have nailed it. I never knew that about the grids. I've always saved the DE for after the start up. Penny wise, pound foolish I guess. Going to follow that link now and see what I've let myself in for. Thanks, guys.
    35,000 gallon Anthony & Sylvan, plaster over concrete, Purex Triton FNSP 60 filter with DE, 2 hp pump, Nature2 clearvision system, Polaris robot.

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