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Thread: Undersized pump?

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    Join Date
    Jun 2015
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    Ottawa/Ontario
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    335

    Undersized pump?

    Hi All

    Question on pumps. We are using a Tristar 0.5hp pump for our pool, but only have 1.5 inch line. The issue, I am told, is that the Tristar pump cannot draw enough water through an 1 1/2" to completely fill the basket, it needs 2" plumbing for that. It just so happens that this was an afterthought and the pool does not have a 2" suction line. I am also told that if we had a 1 HP Superpump installed there would be no air and there should be no air in your initial pump. Despite all of this, I am also told that the air in the pump does not cause any issues, the heater and salt system will still work with more than enough pressure . Thoughts from the brilliant minds in this group?

    Cheers
    Tom


    18x36 inground vinyl pool with ASG.
    sand filter
    0.5 hp Tristar
    Hayward 250K heater
    Direct PV Lorentz Pump, wired to 1,500 W of solar panels.
    20000 gallon, IG, SWG, Sand Filter, Hayward 1/2HP + Lorentz direct solsr PV pump

  2. Back To Top    #2
    bobodaclown's Avatar
    Join Date
    Apr 2011
    Location
    Lakeland, FL
    Posts
    2,351

    Re: Undersized pump?

    You're fine, the pump is fine, and your saving energy over the 1hp motor. Enjoy the pool.
    17K Kidney Shaped Pool Concrete (Diamond Bright) Pool, 3/4 hp 2 speed 115V Sta-rite Duraglas PEA5D-180L/P2R5D-181L (Impeller C105-92PS Diffuser C1-216P), 1.5 piping, Pentair CC100 Filter , Heat Siphon 100K BTU Heat Pump Pool Heater, Flow meter Blue White Flowmeter Model No. F-30150P, Hayward Astrolight SP0581N, SWCG CalimarTitanium Edition TE45 , Dolphin Nautilus Plus with CleverClean, Lakeland Florida

  3. Back To Top    #3

    Join Date
    Jun 2015
    Location
    Ottawa/Ontario
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    335

    Re: Undersized pump?

    Well that's the best news I have heard all day! Thanks bobo!


    18x36 inground vinyl pool with ASG.
    sand filter
    0.5 hp Tristar
    Hayward 250K heater
    Direct PV Lorentz Pump, wired to 1,500 W of solar panels.
    20000 gallon, IG, SWG, Sand Filter, Hayward 1/2HP + Lorentz direct solsr PV pump

  4. Back To Top    #4
    sargent's Avatar
    Join Date
    Aug 2013
    Location
    Tulsa, OK
    Posts
    291

    Re: Undersized pump?

    The Tristar is a high flow pump. Your 1/2 horsepower Tristar is roughly equivalent to a 1 horsepower (uprated) Super Pump in terms of the amount of flow you would see (and in energy cost). So changing the pump will not solve a problem of air in the pump basket. But the pump size is not your problem. As bobo said, your pump is fine. I have a 1 hp uprated pump on 1-1/2 inch plumbing, and I usually have no (or very little) air in the basket. If there is air in your pump basket it is probably due to a suction side air leak. Perhaps air is leaking through the O-ring on the basket. Try lubing the ring to see if that helps. Or a low water level could cause you to suck some air in through your skimmer.
    14k gal IG vinyl, Jandy Flopro 1 hp up-rated, 2 spd pump, Hayward 325 sq ft cartridge filter, Circupool Si-40 SWCG

  5. Back To Top    #5

    Join Date
    Jun 2015
    Location
    Ottawa/Ontario
    Posts
    335

    Re: Undersized pump?

    Will give the lube a try. It is a brand new pump though so O ring should be in good shape. Water level in pool is 1/2 way up skimmer, and no air bubbles are coming out of the jets.


    18x36 inground vinyl pool with ASG.
    sand filter
    0.5 hp Tristar
    Hayward 250K heater
    Direct PV Lorentz Pump, wired to 1,500 W of solar panels.
    20000 gallon, IG, SWG, Sand Filter, Hayward 1/2HP + Lorentz direct solsr PV pump

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