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Thread: I am worried. Only two return lines?

  1. Back To Top    #1

    Join Date
    Aug 2011
    Location
    Mechanicsburg, PA
    Posts
    40

    I am worried. Only two return lines?

    PB put only two return lines (plus one for cleaner). Both return lines run from one 2" supply. Based on calculations 2" can supply 76GPM and 35000G pool will need 73GPM for 8h turn over.
    Does that look like a problem running on maximum pipe capacity? Will it cause pump to not run efficently?
    Should we put separate 2" pipe for each return? Add another turn?

    Two skimmers have separate 2" lines to the pump. No main dains.
    IG double roman vinyl 40x20. 35000 gal. 9' deep. Diving board.Pentair 400HD gas heater, ItelliFlow Variable Flow pump, 520 cartridge filter, two pentair G5 lights, IC60 SWG cell.
    Photo album: http://slava.no-ip.org/~poolpic/photo

  2. Back To Top    #2

    Re: I am worried. Only two return lines?

    I would use a separate 2-inch PVC pipe for each return.

    How far will the equipment be from the pool?

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

    Re: I am worried. Only two return lines?

    Commercial pools really need three or four turnovers a day, but a residential pool is totally fine with two turnovers a day, or even less. "Maximum" flow rates for PVC pipe are not hard limits, you can always pump more water through the pipe it just gets progressively less efficient.

    For a pool that size it is certainly a very good idea to run at least two 2" pipes in each direction, preferably three, but everything will still work even if you only have one pipe each direction.
    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

  4. Back To Top    #4

    Re: I am worried. Only two return lines?

    I am a newbie in the middle of a DIY 20 x 40 vinyl install, so I am not an expert. But I would be concerned. Returns are not that expensive considering what they give you. I have 3 returns in the walls 2 on one line 1 on it own, 2 in the steps on their own line, plus I have 4 deck jets and a slide that will help circulate water each on their own line. I also do not have a main drain, two of my returns will be aimed at the bottom of the pool. All is 2".
    Under construction DIY 20x40 vinyl liner steel wall pool, Pentair 2hp wisperflo, Pentair tr100 sand filter, Pentair Minimax 400k heater, diving board, 8 foot sit n step, xtream waterslide, 1700 concrete deck, one amazing wife, 4 children and two German shepherds.

  5. Back To Top    #5

    Join Date
    Aug 2011
    Location
    Mechanicsburg, PA
    Posts
    40

    Re: I am worried. Only two return lines?

    PB builder put another return line. So I have now two lines from skimmers, and two lines for three returns.
    Looks like I am ok now.
    Thank you guys for responding.
    IG double roman vinyl 40x20. 35000 gal. 9' deep. Diving board.Pentair 400HD gas heater, ItelliFlow Variable Flow pump, 520 cartridge filter, two pentair G5 lights, IC60 SWG cell.
    Photo album: http://slava.no-ip.org/~poolpic/photo

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