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Thread: Two speed or Variable speed pump. Which is best in my case?

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    Two speed or Variable speed pump. Which is best in my case?

    As you can see in my sig I purchased a house with a pool that runs a 2 hp single speed pool pump with a Polaris booster pump and my pool is only 20K gallons. I do have a spa with 5 jets but I still think my pump is way overkill and running too high all the time.

    Can I get a variable speed pump that would do the job of both and save me a lot of money in the long run or can a two speed do the trick.

    $.10 kWh and living in south Texas my pool never closes. Also have a SWG.

    Any help on which ones are more reliable and/or more efficient would be appreciated!

    Edit: also have a 12 year old challenger pump. Would it be dumb to get a variable motor for the pump instead of the entire thing so I dont have to replumb?
    20K IG Pool with Spa (Plaster); Purex Triton Nautilus FNS 60 DE Filter; Purex Triton Minimax Plus 400 Heater; Pentair challenger 2hp single speed filter pump; Century Centurion 3/4 hp Booster (pool cleaner) Pump; Polaris 380 pool cleaner; Pentair 320 Chlorine Inline Feeder (not used); Circupool RJ45 SWCG.

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    Isaac-1's Avatar
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    Re: Two speed or Variable speed pump. Which is best in my ca

    In your case I would suggest just replacing the motor with a 2 speed motor, assuming the pump is otherwise in good shape (you will want to change the shaft seal while you are at it).

    Ike
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
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    Re: Two speed or Variable speed pump. Which is best in my ca

    Can I eliminate the booster pump for the Polaris or should I just leave well enough alone?
    20K IG Pool with Spa (Plaster); Purex Triton Nautilus FNS 60 DE Filter; Purex Triton Minimax Plus 400 Heater; Pentair challenger 2hp single speed filter pump; Century Centurion 3/4 hp Booster (pool cleaner) Pump; Polaris 380 pool cleaner; Pentair 320 Chlorine Inline Feeder (not used); Circupool RJ45 SWCG.

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    Mod Squad jblizzle's Avatar
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    Re: Two speed or Variable speed pump. Which is best in my ca

    You can not eliminate the booster pump unless you also get a different cleaner. The cleaner you have is designed for high pressure low flow rate from a booster pump. Other cleaners work on lower pressure higher flow rates that a regular pool pump provides.

    How is the spa jet strength for you? If it is fine, then I agree with Ike that you could just get an equivalent 2-speed 2HP motor (assuming your current pump is wired for 230V). You would then only need to run on high speed for the spa jets, or while backwashing the filter. The booster pump will work fine with the pool pump on low speed.

    Your power is pretty cheap and the extra cost of a full VS pump may not every get paid off.
    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: Two speed or Variable speed pump. Which is best in my ca

    Thanks! That is exactly what I needed to hear!!

    Ok one more question while on the thread. I'm switching to cartridge filters as my de filter has a leak at the inlet pipe and I can't get it stopped. What size cartridge filter would you recommend? The bigger the better, right?
    20K IG Pool with Spa (Plaster); Purex Triton Nautilus FNS 60 DE Filter; Purex Triton Minimax Plus 400 Heater; Pentair challenger 2hp single speed filter pump; Century Centurion 3/4 hp Booster (pool cleaner) Pump; Polaris 380 pool cleaner; Pentair 320 Chlorine Inline Feeder (not used); Circupool RJ45 SWCG.

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    Mod Squad jblizzle's Avatar
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    Re: Two speed or Variable speed pump. Which is best in my ca

    For cartridges, there is no such thing as too big, the bigger they are the less frequent the cleaning. Although at some point you are just wasting money, depending on the length of your season as you may not even need to clean it once a year.

    A 300 sqft would be plenty big if not already overkill. Look for a deal on a filter between 150-300 sqft. I know that is a big range, but like I said going large will not hurt anything but your wallet.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
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    Mod Squad jblizzle's Avatar
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    Re: Two speed or Variable speed pump. Which is best in my ca

    I was just doing some reading of the discussions we have had on filter sizing ... it is far from definitive.
    One person has a 150 sqft cart on a 19k pool and claims to have to clean monthly
    Another has a 150 sqft cart on a 20k pool and claims to only have to clean yearly.

    Clearly it greatly depends on your debris load.

    Based on the "rules", around 150 sqft is likely the minimum you should get based on the expected flow rates you will have (this may even still be a bit small given your large pump). So, I would again suggest look closer to the 300 side of the range to provide lower head loss, lower flow rate through the filter media (better filtering), and more time between cleanings.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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    Re: Two speed or Variable speed pump. Which is best in my ca

    I was leaning that way already. Thanks!!
    20K IG Pool with Spa (Plaster); Purex Triton Nautilus FNS 60 DE Filter; Purex Triton Minimax Plus 400 Heater; Pentair challenger 2hp single speed filter pump; Century Centurion 3/4 hp Booster (pool cleaner) Pump; Polaris 380 pool cleaner; Pentair 320 Chlorine Inline Feeder (not used); Circupool RJ45 SWCG.

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