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Thread: variable speed pump, will it circulate water enough on low?

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    variable speed pump, will it circulate water enough on low?

    I replaced my dying 2 speed pump with a variable speed.

    My pool only has a single intake at the top of the pool with a skimmer basket(unlike most of the other pools in my neighborhood, which also have an intake at the bottom of the deep end of the pool).

    With this setup, if I leave my pump on the very lowest setting (for 18-22 hours a day), will it filter and circulate the water all properly? or am I just going to be filtering and mixing the water on the top of that half of the pool?

    I would love to get as much energy savings as possible, and on low setting it uses a ton less energy than my 2 speed does(even running it the extra time to get the same turnover rate) but I just want to make sure I don't need some sort of minimum water movement with that to actually mix up and filter all of the water.

    Thanks!

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    Mod Squad pooldv's Avatar
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    Re: variable speed pump, will it circulate water enough on low?

    No minimum flow or turnover required in a residential pool. Just need to keep chlorine at target and run the pump enough to keep the water clean and skimmed.

    I run my variable speed pump at 1100 rpm for skimming and making chlorine with SWG. It draws 150 watts at 1100 rpm. We have a ton of trees so during fall and spring my pump runs 24x7 to keep tree stuff skimmed and off the bottom. When trees aren't dropping stuff it usually runs 12 hrs. At 10.25c/kWh it costs less than $12/mo to run my pump 24x7.
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    Wildcat's Avatar
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    Re: variable speed pump, will it circulate water enough on low?

    I have a VS but I also have popups,no vac. So I run a few hours at high speed,2500 RPM to have the popups work efficiently and then few hours at 1000 rpm to filter most effectively and save electricity. Brushing helps.

    Even if I didn't have popups and no vac I would have to run at higher rpm to allow skimmer to work. The prevailing wind blows surface items to the far end of the pool away from the skimmer and at low rpm the circulation can't overcome the breeze
    10000 Gal, IG Pebbletec, pop up cleaners,Hayward EcoStar VS, 425 sq ft Hayward Cartridge, waterfall feature

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    Richard320's Avatar
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    Re: variable speed pump, will it circulate water enough on low?

    Point the returns downward if you're worried about circulation. Regular brushing will also ensure the water gets mixed, as will swimmers. I discovered that 3/4" PVC pipe will friction-fit inside my return eyeballs. I cut some stubs and friction fit a 45 on it to enable better aiming.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: variable speed pump, will it circulate water enough on low?

    A VS lolw settings biggest flaw is skimming. There is not a lot of suction, and if yoru skimmer is not down wind, then it will not really catch all that much, and you will be let with manual skimming
    IG W/Vinyl Liner Oval 18x40, 21K gal, Oval 3'-8'
    Pentair Intelliflo VS Pump, Sand Filter

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    Re: variable speed pump, will it circulate water enough on low?

    OK, so it sounds like I don't really have to be worried at all about water on the bottom of the pool getting circulation if I just leave it on the lowest setting?

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    Re: variable speed pump, will it circulate water enough on low?

    I also have a vs pump. Run it 1200rpm 8 to 10 hours. 18 plus hours seems a awful lot.
    12 x 26 Viking FG IG, Bermuda Model, 3 1/2' to 5', 7000 Gallons, Diamond Series Maya, Hayward 1 1/2 HP Maxflo VS, Hayward Stay Clear Plus Cart Filter C17502(S), Hayward Aqua Rite SWG w/T3 cell, Color Changing FIBERSTAR Lighting, Aqua Bot Supreme Robotic cleaner, Brushed Concrete with CCI Liberty Tan color, Taylor K-2006 test kit, Armor Foundation penetrating concrete sealer(lifetime warranty).

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    Mod Squad pooldv's Avatar
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    Re: variable speed pump, will it circulate water enough on low?

    Not at my house. There are time when I have to empty skimmer baskets more than hourly. But, we love our trees. It just depends how much stuff falls in your pool.
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    Re: variable speed pump, will it circulate water enough on low?

    I fully understand. Each house and pool is a different situation.
    12 x 26 Viking FG IG, Bermuda Model, 3 1/2' to 5', 7000 Gallons, Diamond Series Maya, Hayward 1 1/2 HP Maxflo VS, Hayward Stay Clear Plus Cart Filter C17502(S), Hayward Aqua Rite SWG w/T3 cell, Color Changing FIBERSTAR Lighting, Aqua Bot Supreme Robotic cleaner, Brushed Concrete with CCI Liberty Tan color, Taylor K-2006 test kit, Armor Foundation penetrating concrete sealer(lifetime warranty).

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    EVChargeGuy's Avatar
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    Re: variable speed pump, will it circulate water enough on low?

    With the VSP Im a 24/7 guy as i also have trees dropping stuff in the pool all the time. Of course no issue circulating enough water
    I run the VSP @ 1420RPM/150w for 18hrs & 2240RPM/535w for 6 hrs- I also crank it up to 3000RPM for back washing the filter.

    the low speed is just enough to keep the skimmer working and the higher speed is just fast enough to trigger the pressure switch on the heater.
    My old 2hp single speed pump was just over 2000w
    the VS running 24/7 uses about 35% of the power the single speed used for 8 hrs
    Better yet, you cant hear it
    IG Tear Drop, Dark Gray Gunite , 27,000 gallons -Age 50+-years, very old Hayward Split Egg Sand Filter with side mount Multi-port- Hayward SP2600VSP Pump- Hayward chlorine feed (not used since finding TFP) - Laars 315K BTU Oil heater- LoopLoc Safety cover- AquaBot RAPIDS 4WD- TF-100 Test Kit w/ Speedstir- 390 Gal Hot Springs Spa Envoy installed May 2017

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