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Thread: Waterways 6" Ultra Suction Equalizer

  1. Back To Top    #1
    wpbucher's Avatar
    Join Date
    Feb 2012
    South-Central Pennsylvania

    Waterways 6" Ultra Suction Equalizer

    In the process of building a steel walled vinyl liner the pool.

    Pool will have a waterfall with an expected flow rate of 150 gpm.

    PB has installed two 1.5" threaded fittings to accept the Waterways 6" Ultra Suction Equalizer.

    The Waterways 6" Ultra suction equalizer can fit 2" and 2.5" threaded fittings, but the PB (I searched also) could not find the larger fittings.

    The fittings go almost immediately to 3" pipe. The 3" is then teed together to satisfy VGB.

    The return (waterfall source) is 3" pipe.

    The pump is to be a 2HP WhisperFlo pump.

    The PB has the suction lines space to comply with VGB.

    I'm concerned about the water velocity at the equalizer cover.

    VGB states that it should no exceed 6 ft/sec within 3 feet of the suction port.

    Looking at some flow charts, in order to get 75 gpm (2 suction ports yields 150 gpm) through a 1.5" opening would require a velocity of 11.8 ft/sec at the fitting.

    I found some info on the suction cover at

    It states:

    The 6" Ultra Suction is perfect to use for retrofitting and can be used with the following flow rates:
    191 GPM @ 6.02 ft/sec (for 2" Equalizer and 2.5" Threaded),
    136 GPM @ 4.30 ft/sec (for 2" Threaded and 2" Insider),
    and 77 GPM @ 2.43 ft/sec (for 1.5" Threaded and 1.5" Insider).

    I'm trying to figure out these numbers for the 1.5" threaded.

    Why is the flow given at 2.43 ft/sec? Is this saying that the cover acts as sort of a suction diffuser, thus enabling a 77 GPM flow rate with only a 2.43 ft/sec water velocity at the point of suction for a 1.5" threaded pipe?

    If this is the case...then we are good to go.

    Finally, does the 1.5" return fitting introduce any significant head loss?
    I found head loss figures for (per 100'). What about for just a 1.5" suction port?

    Thanks for you help.
    2013 HotSpring Grandee with Ace Sanitizing System
    25K IG vinyl pool with Alps spillover spa and waterfall. Build Date: June 2013
    Triton II TR100 Sand Filter, Pentair Master Temp 400 natural gas pool heater, Intellichlor SWG, Rainbow Chlorine Feeder
    Pentair VF filter pump, WhisperFlo 2 hp WFE-8 waterfall pump, WhisperFloFX 2 hp spillover spa pump
    Intellibrite 5G (2 pool and 1 in spa) lights :: TFT-100 test kit, Taylor K-1776 test kit

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Waterways 6" Ultra Suction Equalizer

    You should be fine. Using 1.5" fittings isn't ideal, but it isn't a big deal either. They will add just a tiny bit of extra dynamic head, since the water only needs to go down to that size for a very short distance.

    The drain cover is listing the flow rate in ft/sec at the outside of the drain cover, where a person could come into contact with the cover. The flow rate in ft/sec will be higher inside the threaded fitting, but you can't get your body into there.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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