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Thread: Normal PSI

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    Join Date
    Aug 2015

    Normal PSI

    I am new (first post). Not sure I'm doing this right....if I'm not....I would appreciate some guidance. I have an in ground gunnite pool (16x34).....Triton 2 sand filter....Hayward SP 1.0hp pump. The pump is brand new, install two days ago.....replacing the exact same model of pump...with no changes in plumbing. I immediately back washed the filter. The psi read 17. My old pump "base" psi was 12. Should I be concerned with the new psi of 17? Seems high. Does that indicate I should not back wash until the psi reaches 27? Any advise is appreciated......thank you.

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    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Normal PSI

    Welcome to the forum.

    At first glance, it would seem your new pump is "pushing harder" but that may not be the case. Did you do anything else that would cause more resistance on the pressure side. did you do anything else that would have reduced any restrictions on the suction side? In short, is the new pump the ONLY variable? Is it the same gauge?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  3. Back To Top    #3

    Join Date
    Apr 2015
    South Central PA

    Re: Normal PSI

    You may want to post this in the Pumping Station section if you haven't received an answer.....
    20000 gallon vinyl liner in ground pool
    16' X 34' rectangular diving pool
    Hayward Pro Grid DE Filter
    Hayward 1 hp Super Pump
    TF-100 Test Kit Stenner 45MPHP10

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    Mod Squad JVTrain's Avatar
    Join Date
    Feb 2014
    Central Minnesota

    Re: Normal PSI

    If 17 is your new "clean" pressure, you certainly don't want to wait until 27 psi to backwash. The recommendations here are to backwash at 25% increase in filter pressure. For you that would be 21-22 psi.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

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