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Thread: Changes in PSI on my filter

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    Join Date
    Mar 2007
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    Ontario
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    Changes in PSI on my filter

    Hi,
    I have a 3 way valve hooked up on my return line.
    One line goes to two returns in the pool and two returns in the steps.
    The other goes to a jetted tub. When I run the returns my PSI is 15 or 16.
    When I run just the jetted tub it jumps to 30psi. Does this sound normal is there
    any problem with the PSI at 30? Thanks
    16x32 inground vinyl 8' deep end
    1hp Northstar Pump, 20" Sand Filter
    6ft Double Lounge, 2 Aqua Lamps w/remote
    216sqft Sungrabber Panels (9- 2'x12') a little undersized

  2. Back To Top    #2

    In the Industry

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    Mar 2008
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    It seems to me that it makes sense. How many jets do you have in your tub and what size are they? What size are the pool returns? Chances are the tub returns are probably smaller and you have less of them so it is harder for the water to flow through. This would make the pressure reading higher.

  3. Back To Top    #3

    Join Date
    Jul 2007
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    North of Dallas
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    is the jump when you close the pool returns and open the tub returns? So you have 4 returns in the pool; how many in the tub? The tub probably has smaller internal pipes or tighter outlets for the jet effect, therefore it can't flow as fast, bumping up the pressure.
    My Pool - 18x24 fully setup Cabana, 22x48 gunite/quartz plaster (3-5-3 depth) & 8' spa w/ spill and 5' natural rock waterfall; Hayward DE filter/pumps/heater; Hayward Pro Logic controller; Phantom cleaner. Finished 06/01/07.

    RedishConstruction.com

  4. Back To Top    #4

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    Thanks for the replies. It jumps when I shut off the returns and open the tub.
    There are four returns in the tub but they do look smaller(tighter). So as you said
    I quess thats why the pressure jumps. Thanks
    16x32 inground vinyl 8' deep end
    1hp Northstar Pump, 20" Sand Filter
    6ft Double Lounge, 2 Aqua Lamps w/remote
    216sqft Sungrabber Panels (9- 2'x12') a little undersized

  5. Back To Top    #5
    mas985's Avatar
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    May 2007
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    Pleasanton, CA
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    11,488
    I think the reason you are seeing such a high rise in PSI is because you only have 4 jets. The fewer the jets you have, the higher the PSI rise will be because of the higher the flow per jet.

    What size pump are you running?
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

  6. Back To Top    #6

    Join Date
    Mar 2007
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    Ontario
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    The replies make sence. I have the same pump as you 1hp Hayward Northstar. Thanks
    16x32 inground vinyl 8' deep end
    1hp Northstar Pump, 20" Sand Filter
    6ft Double Lounge, 2 Aqua Lamps w/remote
    216sqft Sungrabber Panels (9- 2'x12') a little undersized

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