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Thread: Variable or 2-speed for SWG pool?

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    Variable or 2-speed for SWG pool?

    The builder we're considering has specified a two-speed pump, but are there reasons to consider a variable speed instead for a small salt water pool?
    8K gal 13'Wx19'L IG kidney. 3.5' to 5'6" depth. Pentair: Ultratemp 120 heater/chiller; Intelliflo 2 VS pump; Intellichlor IC40 SWG; cartridge filter; EasyTouch controller. 3 wall returns, 1 skimmer, 1 cleaner line. Tremron Oak Run coping and pavers. Noble Tile Toscano waterline. Marbletite's Freestone pebble in St. Thomas. TF100 and K1766 test kits.

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    Mod Squad jblizzle's Avatar
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    Re: Variable or 2-speed for SWG pool?

    A VS might save a little more electricity and allow you to dial in the flow rate you want.

    But, the VS is more prone to problems with nearby lightning strikes. So, in FL, if you go VS you should add surge protection as well.

    Do you have an special high flow needs? If not, the Whisperflo 2-speed is likely oversized which will use more power than you need.
    Jason, TFP Moderator
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    Re: Variable or 2-speed for SWG pool?

    No special high flow needs here. So do I understand you, that a variable speed could be less costly because it will allow a lower speed than the lowest speed on a two-speed? (Wow, that's a lot of "speeds"!)
    8K gal 13'Wx19'L IG kidney. 3.5' to 5'6" depth. Pentair: Ultratemp 120 heater/chiller; Intelliflo 2 VS pump; Intellichlor IC40 SWG; cartridge filter; EasyTouch controller. 3 wall returns, 1 skimmer, 1 cleaner line. Tremron Oak Run coping and pavers. Noble Tile Toscano waterline. Marbletite's Freestone pebble in St. Thomas. TF100 and K1766 test kits.

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    Mod Squad jblizzle's Avatar
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    Re: Variable or 2-speed for SWG pool?

    A 2-speed runs at full speed (3650) or half speed (1825 rpm). At half speed it is moving 1/2 the water and using 1/4 the power of high speed.

    A VS is often most efficient down at 1000 rpm (although that might be too slow and not enough flow for your SWG to work). If you save 75% on power dropping from high speed to half speed, that only gives you 25% of the electrical left to save. So dropping from 1825 to 1000 might only save you 15% more than just going from high to low.

    So, the 2-speed gets you a bulk of the energy savings (and less worry about lightning and not needing the surge protection).
    The VS will get you a little more electrical savings, but might need to buy the surge protection and the VS pump costs more up front.

    What size Whisperflo are you specked for? At the most you would need the 0.75 HP. And really you could save more by just getting a 1HP Superflo 2-speed which is a smaller pump that will use less power than the Whisperflo.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Re: Variable or 2-speed for SWG pool?

    Thank you for the explanation, Jason.

    I emailed the builder to ask about the Whisperflo size spec and this was her response:

    "That is determined by the county...based on gpm, size of plumbing distance from pump and spec on pump"

    I thought that was a little odd, since she was out here to do the estimate, but maybe that's a normal response to such as question?

    In any case, with a pool as tiny as the one we're planning on, and the fact that the pump equipment will be maybe 12 feet from the pool, seems like your 1HP Superflo two-speed is a good solution.
    8K gal 13'Wx19'L IG kidney. 3.5' to 5'6" depth. Pentair: Ultratemp 120 heater/chiller; Intelliflo 2 VS pump; Intellichlor IC40 SWG; cartridge filter; EasyTouch controller. 3 wall returns, 1 skimmer, 1 cleaner line. Tremron Oak Run coping and pavers. Noble Tile Toscano waterline. Marbletite's Freestone pebble in St. Thomas. TF100 and K1766 test kits.

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    Re: Variable or 2-speed for SWG pool?

    Quote Originally Posted by Plazaglass View Post
    Thank you for the explanation, Jason.

    I emailed the builder to ask about the Whisperflo size spec and this was her response:

    "That is determined by the county...based on gpm, size of plumbing distance from pump and spec on pump"

    I thought that was a little odd, since she was out here to do the estimate, but maybe that's a normal response to such as question?

    In any case, with a pool as tiny as the one we're planning on, and the fact that the pump equipment will be maybe 12 feet from the pool, seems like your 1HP Superflo two-speed is a good solution.
    Sounds odd to me too.

    Give the county a call and tell them your trying to understand how to select the most energy efficient/cost effective option for your pool.
    In ground, 14,000 gallon, white plaster, unheated, stone waterfall, DE Filter, Rainbow 320 Cl, Polaris 3900, FloVis flow meter, F100 test kit, Circupool RJ30+ SWG, Circupool VJ1/Speck Badu EcoM3V variable speed pump.

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    Re: Variable or 2-speed for SWG pool?

    I will bet a buck fifty that if you call the county and ask them to make a recommendation to you about a pool pump the silence will be deafening.
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    Re: Variable or 2-speed for SWG pool?

    Thanks, everybody!

    I've just emailed the pool builder to ask about the SuperFlo.

    Mary

    - - - Updated - - -

    Quote Originally Posted by pooldv View Post
    I will bet a buck fifty that if you call the county and ask them to make a recommendation to you about a pool pump the silence will be deafening.
    No doubt!
    8K gal 13'Wx19'L IG kidney. 3.5' to 5'6" depth. Pentair: Ultratemp 120 heater/chiller; Intelliflo 2 VS pump; Intellichlor IC40 SWG; cartridge filter; EasyTouch controller. 3 wall returns, 1 skimmer, 1 cleaner line. Tremron Oak Run coping and pavers. Noble Tile Toscano waterline. Marbletite's Freestone pebble in St. Thomas. TF100 and K1766 test kits.

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