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Thread: In ground pool plumbing

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    In ground pool plumbing


    I am installing a steel wall in ground pool and have a couple of plumbing questions.

    Are 2 - 45 degree fittings better than 1 - 90 degree fitting or does it matter.

    Pictures show my intentions. I have not yet glued the connections.

    Does anyone have a picture of their plumbing before back filling.

    Thanks ... uild89.jpg ... uild88.jpg
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    Join Date
    May 2007
    South Central NJ

    Re: In ground pool plumbing

    For practical purposes, using two 45s to make a 90 does not make a difference except it's a pair of extra glue joints.

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    Sticky's Avatar
    Join Date
    Oct 2009
    WoyWoy Australia

    Re: In ground pool plumbing


    I think two 45 joined to form a 90 would give less resistance as the angle is not as sharp more curved but it probably would be much unless you had a of of 90 in your plumbing .
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    Isaac-1's Avatar
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    May 2010
    SW Louisiana

    Re: In ground pool plumbing

    Yes, sweeping curves are better than sharp corners, just make sure you have pressure type PVC fittings not the shorter glue joint drain DWV type fittings (45's are a lot more common in dwv). I had to jackhammer up the concrete at the corner of my pool earlier this year because someone used a DWV elbow fitting on the return line (it lasted for 30 years almost to the week before blowing out).

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    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: In ground pool plumbing

    Mas985 has done the math but I can remember that he has said many times that 2-45's simply aren't worth it. Use the 90's.

    If you would liketo reduce the resistance in your system AND make a better pool, I would suggest purchasing a filter that's a little larger than normal.....around 125% or so of your pumps gpm. That'll more than make up for all the resistance within the 90's and give you a better system to boot.
    Dave S.
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    mas985's Avatar
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    May 2007
    Pleasanton, CA

    Re: In ground pool plumbing

    An isolated 45 has a little less than half the head loss of a 90. However, if you put two back to back it can actually be more than a 90 because of the interaction between the fittings and the fact that you have twice the glue joints. So given the uncertainty as to how it would actually work in a real installation, I generally do not recommend back to back 45's or at best indifferent. They take up more room too.

    As for swept 90s, if you have a lot of 90s it may be worth it but I remember seeing a pad with nearly all swept 90s and it was a real mess. They take up a lot of room so the lay out tends to be really messy. Underground would be fine though.

    My usual recommendation is that upsizing the pipe diameter is a far better choice than dealing with special fittings.
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    Re: In ground pool plumbing

    Just use the fitting that gives you the tightest group!

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    Heckpools's Avatar
    Join Date
    Feb 2009
    New Jersey shore

    Re: In ground pool plumbing

    That retun line on an angle isnt a great idea... didnt read everyones post so that may have already been said. But once you back fill, the dirt may "push" on that pipe and cause major problems. I would come out of the pool wall a few inches, into a 90, then straight down to the ground.

    P.s, holy glue joints batman
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