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Thread: what should my filter pressure be?

  1. #1
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    what should my filter pressure be?

    I know this is kind of a vague question..but I just want to get an Idea of where I should be sitting on the reading of my pressure gauge.

    Pool pump and filter are about 22 feet away from the pool. Same level..plumbed with 1 1/2" PVC pipe. I just started my pump and filter system up yesterday and the pressure gauge is reading 14 PSI. Is this about right, should it be more or less??????

    Any insight would be wonderful

    Dan
    33' x 52" Swim and Play Inc. PARAGON AGP. Hayward H200 Heater. Hayward Power-Flo LX 1.5hp pump. Sta-Rite Cristal Flo T-210WF Sand Filter. Stenner 45M5 chlorine pump

  2. #2
    Mod Squad JohnT's Avatar
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    Re: what should my filter pressure be?

    It's within reason, but every pool/pump/filter combination has a different "normal" pressure. There are no hard rules for what you should have.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

  3. #3
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    Re: what should my filter pressure be?

    Read your gauge after the filter(s) have been cleaned, pump and skimmer baskets cleaned, with system running under normal circumstances. This reading will be "normal" for your pool when everything is clean. As the pressure increases, filter(s) are becoming dirty. Usually a 10 psi increase indicates time to clean.
    16K gallon, Pebble tec, beach entry. Two 1 hp Pentair Whisperflos. One for Paramount MDX2 main drain, Paramount debris canister, and Pentair CCP 520 filter. One for skimmer w/sock and Paramount PCC2000 in floor cleaner. 3/4 hp Pentair Pinnacle for waterfall. Fiberstars fiber optic pool lighting. Aqua-Logic AQL-P-4 control panel with wired remote in the house. SWCG system that is not used. Ultra-Pure Ozonator that is not used.

  4. #4
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    Re: what should my filter pressure be?

    Well I just opened the pool from winterization...so skimmer basket was clean..pump basket was clean and sand filter was backwashed last fall a the close of the pool

    So I should assume that the 14 PSI is my normal "clean" pressure, and then I should clean/backwash when I hit about 24 psi??

    Dan
    33' x 52" Swim and Play Inc. PARAGON AGP. Hayward H200 Heater. Hayward Power-Flo LX 1.5hp pump. Sta-Rite Cristal Flo T-210WF Sand Filter. Stenner 45M5 chlorine pump

  5. #5
    Senior Member mas985's Avatar
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    Re: what should my filter pressure be?

    Just to keep things in perspective, a 10 PSI rise is 23 feet of additional head loss. I would never wait that long. I know some manufactures recommend that but I would backwash much sooner than that, +4 PSI, unless I had to do it more than once a week.

    As for your typical pressure, it depends upon your exact setup.

    Do you have multiple suction lines pool to equipment?

    Multiple Return lines?

    Is everything 1.5" plumbing?

    How many return eyeballs and what size?

    Does the gauge go to zero when the pump is off?
    Mark
    Hydraulics 101; Pump Ed 101; Pump and Pool Spreadsheets; Pump Run Time Paper
    18'x36' 20k gallon plaster/gunite pool, 1/2 HP 2sp pump, Aqualogic PS8 SWCG, 420 sq-ft Cartridge Filter, 450 sq-ft EPDM Solar Panel, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

  6. #6
    Mod Squad JohnT's Avatar
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    Re: what should my filter pressure be?

    Quote Originally Posted by mas985
    Just to keep things in perspective, a 10 PSI rise is 23 feet of additional head loss. I would never wait that long. I know some manufactures recommend that but I would backwash much sooner than that, +4 PSI, unless I had to do it more than once a week.
    I agree with Mark. My flow is way down at 3 or 4psi increase from my normal 17psi. Looking at performance curves tells you that a 23 ft head loss moves the performance of a 2.5HP pump down to that of a 1HP pump in a typical pool setup.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

  7. #7
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    Re: what should my filter pressure be?

    some more specifics.
    1 intake (wide mouth skimmer port)
    1 return 1 1/2" return with built in light

    line to pump is 22 feet of 1 1/2" pvc
    line to pool return is 22ft of 1 1/2" pvc
    from sand filter to heater, 2 inch pvc.....from heater to SWG 2 inch pvc...out of SWG cell back to pool 1 1/2" pvc

    Nothing else is on return or suction line. I have a pool robot, so no vacuum on any of the lines or anything.

    My pressure gauge is new and goes to 0 (zero) when the pump is off.
    33' x 52" Swim and Play Inc. PARAGON AGP. Hayward H200 Heater. Hayward Power-Flo LX 1.5hp pump. Sta-Rite Cristal Flo T-210WF Sand Filter. Stenner 45M5 chlorine pump

  8. #8
    Senior Member mas985's Avatar
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    Re: what should my filter pressure be?

    Based upon your equipment/setup, 14 PSI is reasonable and about where it should be.
    Mark
    Hydraulics 101; Pump Ed 101; Pump and Pool Spreadsheets; Pump Run Time Paper
    18'x36' 20k gallon plaster/gunite pool, 1/2 HP 2sp pump, Aqualogic PS8 SWCG, 420 sq-ft Cartridge Filter, 450 sq-ft EPDM Solar Panel, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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