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Thread: Pressure drop with vacuum

  1. Back To Top    #1

    Join Date
    May 2008
    Glenside, PA

    Pressure drop with vacuum

    22K Gallon in-ground
    1 HP WhisperFlo
    25' 1.5" Hose
    Vacuum Plate

    I just installed a new 1 HP 2-speed Pentair WhisperFlo with a 31" Hayward sand filter. When drawing from the skimmer basket or the vacuum inlet on the side of the pool (without vacuum hose/plate) everything looks great with about 11 psi on the filter.

    I hook up the vacuum plate to the hose and lower it in the deep end slowly and shaking it every couple feet to release air bubbles and as soon as I insert it in the vacuum inlet the pump basket goes down to about 2/3 full and pressure drops to 3 or 4 psi. I am able to vacuum the pool but not enough suction to get my old Hayward PoolVac up the inlcine from the deep end to the shallow end.

    I have 1.5" inlets and 1.5" pipe up to the Jandy diverter. Then 2" pipe to the pump and filter and it gets reduced again before the return pipe goes underground.

    Any ideas/suggestions?
    Glenside, PA
    16x32 Vinyl IG, 21K Gals
    1 HP, 2 Speed Whisperflo (WFDS-24) pump, Hayward S310T2 (31"!) sand filter
    Jacuzzi 4-Wheel Tracker vacuum; cheap fountain water feature but great for raising pH
    My layout:

  2. Back To Top    #2
    frustratedpoolmom's Avatar
    Join Date
    May 2007
    SWSuburban Chicago, IL
    Can you hold the hose end to the return to force water back thru to the vacume plate, to be sure all the air is out...then keeping the hose end under water hook it up to the vacume inlet...

    I dunno.....?
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner

  3. Back To Top    #3

    In the Industry
    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida
    Hi, Ken,

    You are sucking air into the pump basket. It sounds like it's coming from the vacuum hose. Start tracing your connections from the skimmer to the vacuum head and you'll find one of them is leaking. (or a hole in a section of hose)
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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