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Thread: Hayward SP3205EE TriStar 1/2HP for 22k gallon inground pool?

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    Hayward SP3205EE TriStar 1/2HP for 22k gallon inground pool? ... 002__I.htm

    I don't see it mentioned too often, I know the goal is usually to get a pump with as low HP as possible and in other threads I still see a lot recommendations on 1HP 2 speeds. Given all my below needs, is there any reason why the tristar 1/2 hp would not be the best pump or why I would require a stronger 2 speed? Or any general reasons not to get it?

    In my situation it will drive either a cartridge or sand filter, I'm still on the fence.

    I have no water falls or anythingx
    I have a large skimmer.
    5 returns, 3 on the pool walls and 2 on pool stairs.
    1 poolskim I would like to start using.
    I manually vaccum and maybe in the future i would use one of those skimmer robots vaccums but iin the past I havent liked the hassle and prefer to vaccum.
    18' x 36" Ovalish 80,000 Litre Vinyl IGP. 2 speed 1HP Hayward pump SP2607X102S. 300 Pound Sand Filter. Summit Sum5 Heat Pump, Goldline Controls Aqua Logic P4 System, T-CELL-15 SWG, Aqua Pod Remote Control, Pentair 7845xx02 light.
    TF-100 Test Kit, SpeedStir Stirrer, Pool Chemist in training.

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    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Hayward SP3205EE TriStar 1/2HP for 22k gallon inground p

    I doubt a .5hp pump will produce enough flow to get an adequate backwash if you stay with sand. Even if you go with a cartridge filter, that's not very much flow for the times you need it. A 1hp 2-speed would be my first choice if it were my pool.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Join Date
    Apr 2011
    Warner Robins, GA

    Re: Hayward SP3205EE TriStar 1/2HP for 22k gallon inground p

    Generally two speed pumps are often recommended because of the savings you can obtain at low speed. However, few can move the volume of water needed to perform other functions. Example would be Backwashing, supporting a pressure cleaner with boost pump, even in some cases vacuuming. Hence to high speed(usually on 2 speed pumps 3150) to perform these tasks.
    16 x 32 Grecian Vinyl. Salt-Aqua Plus PS-4, Hayward Pro Series Sand Filter, Hayward Ecostar SP34000vsp, Gulfstream HE-125-T-A Heat/Cool heat Pump

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    mas985's Avatar
    Join Date
    May 2007
    Pleasanton, CA

    Re: Hayward SP3205EE TriStar 1/2HP for 22k gallon inground p

    I have a 1/2 HP two speed on my pool and it is close the size of your pool. However, I have a cartridge filter. A 300 lbs sand filter will normally require at least 50 GPM for backwash (~15 GPM/sq-ft) which is possible with a 1/2 HP Tristar but it depends on your suction side plumbing setup. The only issue would be if you have a single 1.5" suction pipe, then the flow rate might be too low.

    But you will save much more in energy costs with a two speed and you can get one that has approximately the same head curve as the 1/2 HP TriStar. The SuperFlo 1 URHP pump is slightly more powerful than the 1/2 FRHP TriStar and it comes in a two speed. Full speed is about 20% less efficient than the Tristar but half speed is about 2x more efficient. If you like Hayward products, then the 1 URHP Superpump is very similar to the SuperFlo with about the same performance.
    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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