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Thread: Why a 2 speed pump?

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    Join Date
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    Why a 2 speed pump?

    While reading old posts in the TFP (in various forums), I've seen people recommend getting a 2 speed pump. What's the reason for that?

    Thanks!
    Bart
    700 sq. ft./30,000 gal, gunite pool; 48 SF DE filter; 1.5 HP pump; Salt Water Generator; Solar Heat

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    MikeInTN's Avatar
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    Re: Why a 2 speed pump?

    Energy costs, primarily. Generally, running a two-speed pump on low 24 hours/day uses less energy than running a comparable single speed pump for 8 - 12 hours / day.
    24' x 52" AGP - approx 13,500 gallons
    Pentair Optiflo 1 hp/2sp pump w/ Swimpro Voyager 150 sq ft cartridge filter
    Intex 8110 SWCG
    "Fear the Schnauz!"

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    Re: Why a 2 speed pump?

    And the high speed will lets you run a spa or drain the pool faster.
    20,000 Gallon kidney sort of a sand filtered gunite in ground pool w/ hot tub.

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    Re: Why a 2 speed pump?

    Thanks! Now I have to figure out if I'm getting a 2 speed pump or not.
    700 sq. ft./30,000 gal, gunite pool; 48 SF DE filter; 1.5 HP pump; Salt Water Generator; Solar Heat

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    Re: Why a 2 speed pump?

    Quote Originally Posted by Bart
    Thanks! Now I have to figure out if I'm getting a 2 speed pump or not.
    Check with your local energy company and your state tax guidelines as well. In some areas of the country, you'll get a tax or energy credit for a 2 speed or variable speed pump. It helps cut some of the initial cost along with the long term savings.
    Clearwater, Florida

    12,000 gallon kidney shaped gunite pool
    Pentair Whisperflo 3/4HP Pump
    Pentair CCP420 420sq/ft Cartridge Filter
    Pentair Intellibrite 5G 120V Pool Light

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    Re: Why a 2 speed pump?

    In talking to the pool guy, he said this, "The two speed pumps are available but don't work very well with DE filters. They are mostly used by our competitors that use cartridge filters which are inferior in their ability to take out small particles down to 1 micron. The DE filter is far superior in that regard."

    Does that make sense?
    700 sq. ft./30,000 gal, gunite pool; 48 SF DE filter; 1.5 HP pump; Salt Water Generator; Solar Heat

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    frustratedpoolmom's Avatar
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    Re: Why a 2 speed pump?

    If you want my honest opinion, get a cart and a 2 speed. Of course I am biased, but if you go with an SWG then a cart is the way to go. DE filters are a pain to maintain and you will not be able to tell the difference in water clarity.
    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
    http://www.PerfectlyClearPoolService.com

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    JasonLion's Avatar
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    Re: Why a 2 speed pump?

    When you are charging a DE filter with DE, or backwashing, you need to have a two speed pump on high speed. As long as you do that there shouldn't be any problems.

    DE filters are better at filtering, but most people can't actually see the difference in the water between DE and cartridge (assuming everything else is the same). Of course, some people can see the difference quite clearly.
    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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