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Thread: Thoughts on 2 speed pumps

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    Join Date
    Aug 2007
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    Thoughts on 2 speed pumps

    My 2 month old sta-rite pump has become intermittently loud to the point that my pool dealer thinks that it may have a bearing problem. If indeed the pump is defective(is under warranty), I would have the opprotunity to switch to a different pump(plus or minus the cost difference). I have researched the forum and also anything else online I could find about the benefit of switching to a 2 speed pump vs. the one speed I have now. My current setup is a 14000 gal. AGP with a 1hp single speed that pulls 9 amps and has a 1hp SF. I guess its probably on the same level as an uprated 3/4 hp. I have run this pump for about 11-12 hours a day the last couple months and my water has stayed clean. I am curious what you all think about running a 2 speed and how it would perform for a days running vs. the single speed. How well would the low speed do with picking up tree trash and bugs in the skimmer? How long do you guys with 2 speed motors like to run your pumps on the low setting?
    24' AGP vinyl, 3/4hp Pentair 2-speed, Pentair Quad DE 60
    Pool Rover Jr.
    TF-100

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    JasonLion's Avatar
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    Generally you need to run a two speed motor on low speed for twice as long as a single speed pump but even so it uses between one half and two thirds as much electricity in total. You can put it on high for a little while as needed to vacuum or if you want extra water flow for some reason. The electrical savings can be dramatic.
    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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    Does the 2 speed do as good a job of filtering the water and picking up debris as the single speed? Assuming of course that it is run adequately.
    24' AGP vinyl, 3/4hp Pentair 2-speed, Pentair Quad DE 60
    Pool Rover Jr.
    TF-100

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    mas985's Avatar
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    May 2007
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    Quote Originally Posted by budysr
    Does the 2 speed do as good a job of filtering the water and picking up debris as the single speed? Assuming of course that it is run adequately.
    Yes, it just needs to be run twice as long for the same turnover. Skimming is another issue. It could be better or worse depending on the pool. Lower flow rates mean it won't pass the skimmers as quickly but that could be an advantage if the flow was too fast to begin with.
    Mark
    Hydraulics 101; Pump Ed 101; Pump and Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, 1/2 HP 2sp pump, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater, ThePoolCleaner

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