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Thread: PVC, PVC Schedule 40 or Flex?

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    PVC, PVC Schedule 40 or Flex?

    Finalizing a pool build and the PB is stating that he uses PVC (black) and flex for all the large turns.

    What re your thoughts?

    I have read that he is should be using schedule 40. He claims that sch 40 is too ridgid...
    16'x34' Inground Vinyl Pool. 65,500L. Hayward S244T2 24 Sand Filter. Hayward 1hp Super Pump. Raypak PR266 EN 266,000 btu,. AquaRite SWCG. Aqualamp LED 2 w/ remote

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    Melt In The Sun's Avatar
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    Re: PVC, PVC Schedule 40 or Flex?

    Sch 40 is the standard, because it is the strongest. It is tried and true, and lasts for decades if installed correctly! Flex is convenient for the builder, but many times causes problems down the road.

    Never seen black PVC, at least not around here...black pipe is either ABS (rigid) or poly (flexible).
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    Re: PVC, PVC Schedule 40 or Flex?

    Quote Originally Posted by Melt In The Sun
    Sch 40 is the standard, because it is the strongest. It is tried and true, and lasts for decades if installed correctly! Flex is convenient for the builder, but many times causes problems down the road.

    Never seen black PVC, at least not around here...black pipe is either ABS (rigid) or poly (flexible).
    Thanks. PB was probably referring to poly...

    So if he uses poly and flex is that ok?
    16'x34' Inground Vinyl Pool. 65,500L. Hayward S244T2 24 Sand Filter. Hayward 1hp Super Pump. Raypak PR266 EN 266,000 btu,. AquaRite SWCG. Aqualamp LED 2 w/ remote

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    Re: PVC, PVC Schedule 40 or Flex?

    i understand why he chooses not to use sch 40. it might have to do with the harsh temperatures you guys have in toronto.

    ?
    pool size 15X30 Filters:Cartridge Aboveground Plaster,Pentair Minimax NT Low NOx Series Heater

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    Re: PVC, PVC Schedule 40 or Flex?

    if it helps, i in my years of pool service and my dads 38 years of pool building experience, he has never seen an issue with black poly pipe.
    pool size 15X30 Filters:Cartridge Aboveground Plaster,Pentair Minimax NT Low NOx Series Heater

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    dmanb2b's Avatar
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    Re: PVC, PVC Schedule 40 or Flex?

    I'd also opt for rigid pvc or poly. Flex is just more convenient for the builder but often only used in the tight radius for spa plumbing and encased in gunite, otherwise I would minimize flex pvc use.
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

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    Melt In The Sun's Avatar
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    Re: PVC, PVC Schedule 40 or Flex?

    Didn't notice your location at first...poly is used a lot more in cold areas because it has a little bit of give to it.
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
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    Re: PVC, PVC Schedule 40 or Flex?

    I would use the black poly. Up north thats the prefered pipe for ground that freezes deeper. Even if sme water is left in the pipe, it will expand enough to not burst. Shifting ground wont hurt it either. PVC will shatter to easily. Thats why pool builders and irrigation guys in cold climates use black poly.
    14,000 gallon IG, Vinyl. Hayward 3/4 hp superpump, Penatair IC40 SWCG, Pentair automation, Hayward sand filter, Aqua Comfort heat pump, Hayward 400k Lo-Nox LP heater.

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    Re: PVC, PVC Schedule 40 or Flex?

    Thanks! So a combination of poly and flex is ok for Toronto?
    16'x34' Inground Vinyl Pool. 65,500L. Hayward S244T2 24 Sand Filter. Hayward 1hp Super Pump. Raypak PR266 EN 266,000 btu,. AquaRite SWCG. Aqualamp LED 2 w/ remote

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    Melt In The Sun's Avatar
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    Re: PVC, PVC Schedule 40 or Flex?

    I still say nix the flex. It just isn't as tough as the poly. With poly you want as few buried joints as possible, so transitioning between different kinds of pipe would likely be problematic.
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
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    Re: PVC, PVC Schedule 40 or Flex?

    Quote Originally Posted by Melt In The Sun
    I still say nix the flex. It just isn't as tough as the poly. With poly you want as few buried joints as possible, so transitioning between different kinds of pipe would likely be problematic.

    +1 poly all the way. No joints.
    14,000 gallon IG, Vinyl. Hayward 3/4 hp superpump, Penatair IC40 SWCG, Pentair automation, Hayward sand filter, Aqua Comfort heat pump, Hayward 400k Lo-Nox LP heater.

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    Re: PVC, PVC Schedule 40 or Flex?

    Everything has it's pros and cons.
    poly is durable but can't be glued so the mechanical joints could leak, but the pipe can be curved when warm to achieve a large radius curve.
    PVC is very common, rigid, glued joints are good but it can shatter if something happens since it's brittle compared to poly.
    Flex PVC, glued joints and is the most flexible which will lessen the need for joints. Not as tough as poly or PVC for the most part. (But if you are going to smash each one with a hammer side by side, flex will win. A standard razor blade can cut flex but not poly or pvc)

    Nothing is perfect, it has a lot to do with installation. I personally use all 3 but most often use flex, then some pvc, and then maybe some black on occasion. I've been noticing though that flex above ground does tend to get UV damage the quickest of all three. It can get brown and bubbly. This also might not be the clearest determination though as I've had PVC pipe and black poly pipe look normal and then shatter when attempting to cut them, the pipe had been sitting in the sun for many years.
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    Re: PVC, PVC Schedule 40 or Flex?

    Go with flex, 100' rolls glue fitting at the wall and at the filter been using flex since 1988 because in 1987 when we used poly pipe every roll we got that year was defective and had to replace all lines under warranty "NOT FUN" Only problem with flex and I have only seen it one time is termites and I have used hundreds of rolls of flex pipe in the past twenty five years, make sure to use cleaner and glue designed for flex pipe (Pool Tite) and you should have no problems Just My Opinion

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