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Thread: What should my pressure be?

  1. Back To Top    #1

    Join Date
    Jun 2014
    LI, NY

    What should my pressure be?

    I have a Hayward Micro-Clear DE 4800 filter. What PSI should my gauge read? It's been running about 10 and even when I backwash and rinse, it doesn't seem to lower too much.

    Previous owners did not leave me any manuals and the only one I can seem to find online does not load for me.

    I'm also unsure of how much DE I should add after back washing.
    New Pool Owner - Please help!!
    23k? gallon 16x32 Vinyl IG, Hayward Micro-Clear DE 4800 filter
    Hayward CL220 Chlorine Feeder, Polaris P955 cleaner
    TF-100 test kit, Full sun until 5pm

  2. Back To Top    #2
    Mod Squad
    Join Date
    Aug 2012
    DFW, TX

    Re: What should my pressure be?

    There is no normal. Normal is what the pressure is after you backwash it. Then it should be backwashed again after the pressure rises 20-25%.

    You are supposed to add DE at a rate of 80% of what it called for when it calls for when new. Is there a lable on te filter showing that?
    TFP Moderator
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  3. Back To Top    #3
    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: What should my pressure be?

    The pressure varies depending on how big the pipes are, how far they are away from the pump, how dirty the filter is, whether or not there's a heater, even how many returns there are and how big are they. How often do you backwash. I can usually go nine months to a year between backwashes. If someone suggested you do it monthly, that may be why you see no change; it isn't dirty!

    Ten psi seems a bit low, which is good, if it's accurate. Does the gauge look okay? Is it faded and hard to read? Does it go to zero when the pump is off? Gauges are usually only good for a few years. You might consider replacing it. It's not a difficult job.

    Not knowing anything about the age of the filter and all is worrisome. I know, been there.

    At some point you ought to put on the grubby clothes and open the thing up just to have a look at things. You'll be cleaning the grids annually anyway, the beginning of Summer is as good a time as any. Besides this tutorial, there are tons of videos on youtube, probably some with your exact filter. Dirty clothes, some rags, some pool lube, and a hose and you're in business. And then, when you reassemble it and add the fresh DE, you'll know precisely what your clean filter pressure should be.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
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