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Thread: Need help sizing pool pump!!

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    Need help sizing pool pump!!

    Hey guys, i dont post much here, but have read a lot! the site is so helpful!

    Ok here is the deal..

    27' diameter pool has 48" walls, have expandable liner that is about 5.5' in the center. so maybe 19k gallons?

    i have a Hayward pro series sand filter (s180t).

    it has a flotec 1.5 on it previously... i feel it was probably over sized. i forgot to pull the plug before winter and it froze and busted. so was going to get a new pump.. when i saw the price for this flotec i started thinking maybe i dont need so much pump...
    can someone direct me on a pump that would work better or more efficiently for my application?

    any help is appreciated!

  2. Back To Top    #2

    Join Date
    Apr 2016
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    TX
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    Re: Need help sizing pool pump!!

    Hi Mike,

    I personally am a subscriber to get the biggest pump you can afford that your power mains can handle and that won't burst your pipes or equipment.

    I'm sure some of the smarter folks on here will reply - but I don't think you're going to get more efficiency with a cheaper pump. Some of the really efficient pumps with the programmable RPMs, etc, are going to be a lot more than the 1.5 HP Flotec. For 19000 gallons, I can't imagine going much lower than 1.5HP. You could also invest in a timer if you don't have one. I believe most pools can get back on 10 or so hours of pumping per day during high season.

    Good luck!

    Take care,
    Mo
    Mo - 21K gal, IG plaster, dual Pentair SuperfloXF pumps, 72 sqft DE filter, cartridge filter for the spa, dual Waterco multi-cyclone prefilters, Dual Circupool SWGs, Polaris booster and cleaner, TBD custom controller.

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    CJadamec's Avatar
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    Re: Need help sizing pool pump!!

    If all you have is a pump and filter for an above ground pool you would probably be fine with a 1/2hp pump. If you want to save move on the electric bill buy a 2-speed 1hp pump and run it on low.
    Chuck-
    15x30 AG, Pentair Superflo VS, 19" sand filter, TF-100 test kit
    Aqua Comfort ACT750 heat pump / 6x20 ground mount solar panel / DIY automation

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    duraleigh's Avatar
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    Re: Need help sizing pool pump!!

    I personally am a subscriber to get the biggest pump you can afford that your power mains can handle and that won't burst your pipes or equipment.
    Well, that's not accurate advice. It is pointless to overdrive your filter or pump excessive water through your system that serves no purpose except to drive your electric bill skyward.

    Match a pump to a filter and both of them to your pool,

    CJadamec has your pump sized correctly for you......I would follow his guidelines.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Need help sizing pool pump!!

    thanks guys! i appreciate it... now what brand should i go with? and where can i get the best deal on a pump?

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    CJadamec's Avatar
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    Re: Need help sizing pool pump!!

    Inyopool is a supporter of this site and has great customer service and a lot of information on their site. I wouldn't have any problems recommending any of the brands on their site. Amazon is also a good place to look for product reviews. For that size pump all the major brands are about equal. A 2-speed pump will be more money than the single speed but you should recoup the added upfront cost in utility savings in a season or two.
    Chuck-
    15x30 AG, Pentair Superflo VS, 19" sand filter, TF-100 test kit
    Aqua Comfort ACT750 heat pump / 6x20 ground mount solar panel / DIY automation

    Photos of 2016 Build, Inside Your Breaker Panel, Free Copy of 2017 NEC code
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    mas985's Avatar
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    Re: Need help sizing pool pump!!

    Be careful when comparing pumps because label HP is almost useless. But your pool sounds like an AG pool (a detailed signature would help) and AG pumps tend to cost less than an IG pump. The two speed Pentair Dynamo or OptiFlo are good pumps as well as the Hayward Matrix. Get the smallest two speed you can find at a good price
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    Re: Need help sizing pool pump!!

    thanks guys. Yes it is an above ground pool. i will add some info to my sig!

    I appreciate it!! the flotec i currently have is well over $400.00 and the pumps you suggested even 1hp 2 speed pumps look to be a little under 300 or right at 300.
    so if these will work well then i think that settles it. now a 2 speed pump should be run at the faster speed while getting pool back up in the spring, but then could slow it down for normal maintenance?


    looking at these two
    https://www.amazon.com/gp/product/B0...=AWFPPQUZBOHNP
    https://www.amazon.com/gp/product/B0...=ATVPDKIKX0DER

  9. Back To Top    #9
    mas985's Avatar
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    Re: Need help sizing pool pump!!

    Either one should work fine.

    so if these will work well then i think that settles it. now a 2 speed pump should be run at the faster speed while getting pool back up in the spring, but then could slow it down for normal maintenance?
    Yes. If you use an automated cleaner, you may need high speed for that as well.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    Re: Need help sizing pool pump!!

    If our pump froze it's possible you just need the wet side and keep your existing motor. Won't change your electric bill but will be cheaper than new motor and pump
    24ft x 52in AGP 18000 gal
    sand filter, 200#,1.5 hp single speed pump
    Wood deck (still in progress...)

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    Holydoc's Avatar
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    Re: Need help sizing pool pump!!

    Mike,

    I have a 2-speed pump (low and high) for my 27' round AG pool. I run my pump on Low speed 24/7 for regular filtering and skimming of the pool. Now that I have a robot cleaner, the only times I ever run my pump in high speed is when I am adding chemicals or want to vacuum my pool manually (i.e., my exercise routine). Most here would probably even contend that running it on low for 24/7 is overkill but since my power bill only changed around $10/month, I am not that concerned. Having no debris floating in the water is worth that to me.

    I cannot recommend one pump from another since I have not owned mine long enough to determine what is a good pump and what is a bad. But I am interested to hear what you find out.
    19328 Gallon Above-Ground Pool. Clean&Clear Pentair Cartridge Filter. Opti-flo 2 Stage 1.5hp Pump. Dolphin Nautilus Plus "Flipper" Robot. Established April 2016. Taylor K-2006. Chlorine Based. 340gallon Marquis Spa. Bromine based. Established 2007.

  12. Back To Top    #12

    Re: Need help sizing pool pump!!

    Quote Originally Posted by madwil View Post
    If our pump froze it's possible you just need the wet side and keep your existing motor. Won't change your electric bill but will be cheaper than new motor and pump
    Yes i have thought to do that as well.. mine is pretty old, easily over 12 years, so i figured i may should just get a new one.


    Quote Originally Posted by Holydoc View Post
    Mike,

    I have a 2-speed pump (low and high) for my 27' round AG pool. I run my pump on Low speed 24/7 for regular filtering and skimming of the pool. Now that I have a robot cleaner, the only times I ever run my pump in high speed is when I am adding chemicals or want to vacuum my pool manually (i.e., my exercise routine). Most here would probably even contend that running it on low for 24/7 is overkill but since my power bill only changed around $10/month, I am not that concerned. Having no debris floating in the water is worth that to me.

    I cannot recommend one pump from another since I have not owned mine long enough to determine what is a good pump and what is a bad. But I am interested to hear what you find out.
    thanks for the help! i agree, i may run mine more frequent on low to keep the bugs off the surface as well as the cottonwood tree cotton!
    19000 gallon above ground
    Hayward pro series sand filter
    filter tbd

  13. Back To Top    #13

    Re: Need help sizing pool pump!!

    one more question, do you think i damaged my new filter by not winterizing? i have never made this mistake before but when winter got here and temps got in the teens i thought... oh no the pool. it was to late and the pump was ruined.

    If so how can i check or just run it and see what it does when i get my new pump?
    19000 gallon above ground
    Hayward pro series sand filter
    filter tbd

  14. Back To Top    #14
    mas985's Avatar
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    Re: Need help sizing pool pump!!

    Unless you can see a crack somewhere it might be difficult to tell. Once the pump is running, you will know for sure. But it takes the filter a lot longer to freeze than the pump because of the volume of water.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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