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Thread: Hard plumbing Questions...

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    Hard plumbing Questions...

    I'm in the process of installing a 30' round above ground pool. with a wide mouth skimmer and a 1hp pump. I want to do 2" pvc from the skimmer to the pump. the last pool i did i just used 1.5" and i always felt the 2" pipe on the suction side.

    My question is the pump apears to have threads for 1.5" but the out side of the pump inlet is also threaded can i use the outside threads to keep the flow restriction to a minimum? or do i just use reducers i dont like this as it seems to defeat the idea of two inch pvc

    Pictures of the threads im talking about. let me know what you guys think.



    Thank you!
    Venissa G

    Salt Water Inground 28,000 Gallon
    Installed Fall of 2011
    18x36 Grecian Vinyl
    Hayward Pro Grid Filter/DE 3620
    1.5 HP Superpump
    Cleaning with a Polaris 360
    Located in Sunny Georgia

    Chlorine is my perfume :)

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    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
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    37,879

    Re: Hard plumbing Questions...

    It only makes a very small difference, but yes using a threaded fitting on the outside threads will get you less flow restriction and a more efficient overall system.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: Hard plumbing Questions...

    ok ill see if i can find the fittings for the outside and if not just 1.5x2.5 adapter. rough measurement looks like 2.5" for the outside threads. has any one used these before and might know what size they are?
    Thank you!
    Venissa G

    Salt Water Inground 28,000 Gallon
    Installed Fall of 2011
    18x36 Grecian Vinyl
    Hayward Pro Grid Filter/DE 3620
    1.5 HP Superpump
    Cleaning with a Polaris 360
    Located in Sunny Georgia

    Chlorine is my perfume :)

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    mcoonan's Avatar
    Join Date
    Aug 2008
    Location
    Mendota Heights, MN
    Posts
    292

    Re: Hard plumbing Questions...

    Most of the time those outside threads are for a union not a pipe thread. It might be hard to find an adapter that size. Look at your pump manual for the union p/n and see if you can purchase it in 2".
    Intex Ultra 18' x 52" AG 6,981 Gal.
    3 - 2'x20' solar panels
    Hayward XStream 1500 Cart Filter
    Hayward 1-1/2 HP 2-speed Superpump
    Aquabot Pool Rover
    2-Softub 300 hot tubs (yup just got one for the lake)
    TF Test Kit Doing the BBB for 7 years
    Medota Heights,Minnesota

  5. Back To Top    #5

    Re: Hard plumbing Questions...

    Ill look into the union now that you said that its probably a 1.5" union that fits those threads. Ive done three pools now and ive never heard of this pump / filter manufactor. Its a hydropro 1hp pump and a 24" sand filter gotta pick up 300lbs of fimter sand this week.

    The plan is :
    2" skimer to pump
    2" pump to filter
    1.5" filter to return.

    Im considering doing 2" to the return with a fitting i could add a fountain to incase the water gets to hot. But im not sure if 2" to the return is really needed. All the run should be very short.
    Thank you!
    Venissa G

    Salt Water Inground 28,000 Gallon
    Installed Fall of 2011
    18x36 Grecian Vinyl
    Hayward Pro Grid Filter/DE 3620
    1.5 HP Superpump
    Cleaning with a Polaris 360
    Located in Sunny Georgia

    Chlorine is my perfume :)

  6. Back To Top    #6
    mcoonan's Avatar
    Join Date
    Aug 2008
    Location
    Mendota Heights, MN
    Posts
    292

    Re: Hard plumbing Questions...

    I would stick with 2" all the way around if just to avoid having to buy both 2" and 1 1/2" pipe and fittings.
    Intex Ultra 18' x 52" AG 6,981 Gal.
    3 - 2'x20' solar panels
    Hayward XStream 1500 Cart Filter
    Hayward 1-1/2 HP 2-speed Superpump
    Aquabot Pool Rover
    2-Softub 300 hot tubs (yup just got one for the lake)
    TF Test Kit Doing the BBB for 7 years
    Medota Heights,Minnesota

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