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Thread: low circulation pressure

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    low circulation pressure

    Hi everyone - I am new to pool care, and have been backwashing once a month or so over the winter (about 5 backwashes). I have a DE filter. I have noticed that the suction pressure is dropping. I have a fountain and the pressure on the flow is marginal. In my skimmers, when I reach into them with the pump on, I cannot feel any suction. My filter gauge reads 0, but could be broken. I just read about adding DE after each backwash, which I have not done all winter. I have cleaned the filter basket (which was heavily clogged with earthworms and stuff). Any ideas what to do next? Trying to avoid actually manually cleaning the grids unless absolutely necessary. They are new grids and were installed last May.
    24,400 gallon irregular shaped gunite chlorine pool
    Purex-Triton nautilus NS-36 DE filter;Pentair SM-20-2 multivalve
    MagneTek Centurion Switchless motor 1.5 HP
    Polaris

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    Mod Squad JohnT's Avatar
    Join Date
    Apr 2007
    Location
    SW Indiana
    Posts
    8,617

    Re: low circulation pressure

    You need to manually clean the grids. When you run a DE filter without DE, the grids themselves become clogged. I'd suggest you do it on a day that a pool store is open so you can get replacements before you put it back together if needed.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    Re: low circulation pressure

    Is this something I need to get a professional to do? Or can I muddle through it myself? Filter is a Purex-Triton Nautilus FNS filter.
    24,400 gallon irregular shaped gunite chlorine pool
    Purex-Triton nautilus NS-36 DE filter;Pentair SM-20-2 multivalve
    MagneTek Centurion Switchless motor 1.5 HP
    Polaris

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    Butterfly's Avatar
    Join Date
    May 2007
    Location
    South Carolina
    Posts
    10,045

    Re: low circulation pressure

    Hi rohan and welcome to the forum

    Check out this post by waste (Ted) use-and-care-for-de-filters-t4086.html
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

    ~ One should not use a sledge hammer to swat a mosquito. ~

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    Re: low circulation pressure

    I don't know if it will work for you but I use the magilube to seal all of the gaskets. The pump basket gasket, the pump gasket. In my system, those are notorious for letting air in an pressure low.
    Scott
    1) 24000 gal
    2) DE filter
    3) IG
    4) plaster
    5) 1 hp

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