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Thread: Run pool and spa on one pump?

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    Run pool and spa on one pump?

    While researching variable speed pump options, I'm reading a lot about sizing the pump with spa and pool in mind. My pool, built about a decade ago has a separate pump for the spa outlets. It kicks in when I turn the spa on but otherwise sits idle.

    Now that VSPs are common, is it standard pool design to have both the spa and pool on the single pump and to have the pump switch to high rpms for spa mode? Is this the reason to go with more powerful 3hp pumps?
    Concrete (gunite) inground pool and spa (80,000 litres/21,000 gallons)
    Hayward H350 natural gas heater (electronic)
    Goldline Aquarite chlorine generator
    Hayward pumps, Hayward Pro Series sand filter, Goldline valve actuators

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    Richard320's Avatar
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    Re: Run pool and spa on one pump?

    My spa and pool share the same filter pump and heater. There are three way valves where the two lines T together. There's also a separate spa pump that just recirculates the spa water, but it doesn't heat or filter it. It has its own drain and returns. never use it -- too much aeration cools the water off really fast.
    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: Run pool and spa on one pump?

    My filter pump recirculates the water through the spa and pool. It's just when I turn on the spa "mode" that the dedicated spa pump turns on giving me a more powerful jet in the spa. It does go through the heater.

    I was just wondering if that was the normal setup now that variable speed pumps are commonly available. I've never had occasion to work with any pool other than my own.
    Concrete (gunite) inground pool and spa (80,000 litres/21,000 gallons)
    Hayward H350 natural gas heater (electronic)
    Goldline Aquarite chlorine generator
    Hayward pumps, Hayward Pro Series sand filter, Goldline valve actuators

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    robdac's Avatar
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    Weston, FL
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    Re: Run pool and spa on one pump?

    Quote Originally Posted by Richard320 View Post
    My spa and pool share the same filter pump and heater. There are three way valves where the two lines T together. There's also a separate spa pump that just recirculates the spa water, but it doesn't heat or filter it. It has its own drain and returns. never use it -- too much aeration cools the water off really fast.
    My pool is exactly like this minus the extra spa pump that nobody ever really uses but has to maintain. I have one variable speed pump that handles everything.
    11K gal IG screened-in plaster pool w/ spa
    pentair 150 cartridge filter, Pentair Intelliflow VS pump,
    Aquarite AQR15 SWG, AquaCal Heatwave Heat Pump, TF-100 test kit

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    Re: Run pool and spa on one pump?

    Quote Originally Posted by robdac View Post
    My pool is exactly like this minus the extra spa pump that nobody ever really uses but has to maintain. I have one variable speed pump that handles everything.
    What's the diameter of your lines and what VSP do you have? Just wondering if I can manage this with 1.5" lines.
    Concrete (gunite) inground pool and spa (80,000 litres/21,000 gallons)
    Hayward H350 natural gas heater (electronic)
    Goldline Aquarite chlorine generator
    Hayward pumps, Hayward Pro Series sand filter, Goldline valve actuators

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    Re: Run pool and spa on one pump?

    Your looking for a smaller vsp for your application. I recommend pentair superflo vsp, which can produce up to 1.5 hp. I would run your pool on a very low speed for a long period of time. Lower the speed and longer the run time equals savings on electricity. Then kick it up to high for spa mode. With 1.5" plumbing anything bigger would be a waste.


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    Re: Run pool and spa on one pump?

    Quote Originally Posted by Chncdafied View Post
    Your looking for a smaller vsp for your application. I recommend pentair superflo vsp, which can produce up to 1.5 hp. I would run your pool on a very low speed for a long period of time. Lower the speed and longer the run time equals savings on electricity. Then kick it up to high for spa mode. With 1.5" plumbing anything bigger would be a waste.

    Sent from my SM-N900T using Tapatalk
    Thanks for that. I've sized down to a AO Smith/Century ECM16CU variable speed motor. I will just replace the motor since the pump is only 4 years old and in good shape. Also, that means I don't have to mess with plumbing. I plan to document my job and post back my results.
    Concrete (gunite) inground pool and spa (80,000 litres/21,000 gallons)
    Hayward H350 natural gas heater (electronic)
    Goldline Aquarite chlorine generator
    Hayward pumps, Hayward Pro Series sand filter, Goldline valve actuators

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