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Thread: Spa Jet Pressure Off the Charts

  1. Back To Top    #1

    Join Date
    Jan 2016
    Tampa, FL

    Spa Jet Pressure Off the Charts

    We have an in-ground spa, 6' octagonal x 4' deep (360 gals?). It only has (4) outlet jets, with (2) air makeup pipes in 1/2" pvc. Although we do get relatively good air mix & bubbles, one jet is so powerful, you can't sit near it. The other three are also a bit too strong, just not as bad as that one "super-jet". It has a 1.5 hp Hayward pump (90gpm@40' head), suction side about 30' long w/(6) 90 deg.elbows, all in 2" pvc. The discharge side is about 30' long w/(5) 90 deg. elbows, all in 1.5" pvc. I even tried running the spa with the jet outlets removed.

    I'm wondering if that 1.5 hp pump is simply too powerful? Could the pump impeller be altered or replaced to reduce pump suction? Any suggestions as to perhaps adding a pvc loop accross the suction & discharge plumbing, with a valve to throttle some discharge water back to the suction side before being pushed out to the jets?

    Tampa, FL

  2. Back To Top    #2
    mas985's Avatar
    Join Date
    May 2007
    Pleasanton, CA

    Re: Spa Jet Pressure Off the Charts

    Simple answer is yes, the pump is too powerful. You don't need that much flow rate for only 4 jets. And yes, you could just downsize the impeller rather than replacing the entire pump. A throttling valve would work too but less efficient.

    But before you do anything, what kind of jets do you have and do you know the recommended flow rate? Also, is the pump a dedicated jet pump or is it used for filtering too?
    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

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