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  1. #1
    Senior Member Cake Fan's Avatar
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    Question Can you use grey PVC?

    I'm just curious if (&/or why not) you can use that grey pvc at the Reno store to plumb a tank?
    I asked the *specialist* on duty and all he could tell me was that it is meant for electrical use< Non-conductive to run wires through and not meant for plumbing but he couldn't tell me why not! It looks the same and it's pvc so I don't get it.

  2. #2
    Senior Member pwall's Avatar
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    You can use it.
    At least I do and I'm sure many of us do as well.
    Regards,
    Patrick.
    Ottawa (Orleans), Ontario
    Yahoo IM: pwallnfld

  3. #3
    Senior Member DARK's Avatar
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    Anything that's marked PVC can be used. I've used the electrical pipe when I couldn't find the other stuff especially the long 90 degree 1".

  4. #4
    Senior Member i2ik's Avatar
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    there is the thickness of the PVC. Usually, we used the thickness of the 40 for the tank. On a high pressure pump, i would not be running on anything else lower than 40...
    Richard

    Hobby Experience: Newbie
    600G system, Sifligoi3x400w with ACLS units, 2xH&S A200-2x1260, Schuran Jetstream 2 Ca reactor, 4xVortech Pump, Tunze Stream 6200, Tunze Wavebox, 4xWavy Sea Plus wavemaker, Oceans Motions 4 way, Prolifux Wireless Controller, Red Sea 100mg Ozonizer, Seachem Pinnacle 200GPD RO/DI

  5. #5
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    yes eletrical conduit is fine.

  6. #6
    Senior Member Cake Fan's Avatar
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    Thanks all, great this will be easier/cheaper than going to a plumber. It seems to be slightly thicker than the standard so it'll be good.

  7. #7
    Senior Member tang_man_montreal's Avatar
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    CakeFan,

    While the grey electrical conduit PVC is fine to use, you'll be pleased to know that you can get the white and dark grey PVC in 1/2" to 2" in diameter at the Rona on Harwood blvd in Dorion. They also have a GREAT selection of PVC fittings.

    Another good place is the Club Piscine in Dorion (also on Harwood blvd). They carry mostly 1.5" fittings, some 1", but also carry flexible PVC, and single-union 1.5" ballvalves for $15 which can't be beat.

    Just thought I'd let ya know
    I am Homer of BORG... Prepare to be..OOOO!! DONUT!!!!!!

  8. #8
    Senior Member Cake Fan's Avatar
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    Thanks Vince, the one(s) in Dorion will be way easier to get too.

    I have a small technical question if you don't mind. I'm planning to use this on a closed loop for a softie tank. At sometime in the future I'll need to clean the pump and so I'll need to be able to cut the water off from the pump, what is the best part to use (on either side) for this purpose.

    Last year I was mis-informed and did a boo boo. In the sump I put a mag 7 (as a return from overflow/sump) hoping that it would be a return/circulation and made the return into a spraybar (which 4 distribution outlets/pipes into the tank), which I got almost 0 circulation. (big surprise) Now I have a gen x (1285 gps) and my husband is giving me grief over having to redo the entire thing.

    He wants to cut off 2 of the return lines (in the spraybar)on the mag 7 and still use the mag 7 as a return and some circulation (he says cutting it down from 4 outlets to 2 I'll get ok flow) AND adding only 2 outlets to the gen x.

    I don't know if his plan will work but I want to fix the circulation issues once and for all. Do you see a problem with this &/or any suggestion.

    My other concern is that with that gen x pump and only 2 outlets I might get too much flow in a softie tank BUT I have to resolve this circulation issue and not being anywhere close to understanding plumbing I don't want to have to do this again anytime close to soon :help:

  9. #9
    Senior Member tang_man_montreal's Avatar
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    Quote Originally Posted by Cake Fan
    Thanks Vince, the one(s) in Dorion will be way easier to get too.

    I have a small technical question if you don't mind. I'm planning to use this on a closed loop for a softie tank. At sometime in the future I'll need to clean the pump and so I'll need to be able to cut the water off from the pump, what is the best part to use (on either side) for this purpose.
    No problem... I remembered you were out west like I am, and figured that those places would be more convenient for you. At Rona, All the fittings are in the plumbing area. You'll have to ask one of the people in that department to get you the actual pipe though. Specify white or grey.

    In regards to servicing the pump, the best way would be to to go Club Piscine on Harwood, and buy two 1.5" threaded single union ball valves, and two 1.5" to 3/4" threaded bushings (reducers). You'll want to pick up lots of teflon tape while you're there too. Wrap the tape around the bushing 10 times, and screw it into the union side of the ballvalves, and now wrap teflon tape around the pump input/outputs and put the valves onto the pump. This way, you can close the valves, and easily undo the unions to service your pumps. They also have 3/4" threaded single union ballvalves at that store... but I'm not sure of how you're plumbing your closed loop, so I'll let you decide what works best for you.

    You can see the valve I'm talking about in this picture. The union side is facing the pump.



    Last year I was mis-informed and did a boo boo. In the sump I put a mag 7 (as a return from overflow/sump) hoping that it would be a return/circulation and made the return into a spraybar (which 4 distribution outlets/pipes into the tank), which I got almost 0 circulation. (big surprise) Now I have a gen x (1285 gps) and my husband is giving me grief over having to redo the entire thing.

    He wants to cut off 2 of the return lines (in the spraybar)on the mag 7 and still use the mag 7 as a return and some circulation (he says cutting it down from 4 outlets to 2 I'll get ok flow) AND adding only 2 outlets to the gen x.

    I don't know if his plan will work but I want to fix the circulation issues once and for all. Do you see a problem with this &/or any suggestion.
    Yeah, those spraybars are killers on pumps. Especially on a mag7. How high is your tank relative to the Mag7 pump? Here's a chart that you can use to judge approximate flow loss in relation to height.



    You can already see that at 6ft, the Mag7 is already only putting out half it's flow. And you havn't yet counted any bends, etc in the plumbing. I'd say if your total height is below 5-6ft and your tank is not too large, then you'll be ok using the Mag7 as a return.

    My other concern is that with that gen x pump and only 2 outlets I might get too much flow in a softie tank BUT I have to resolve this circulation issue and not being anywhere close to understanding plumbing I don't want to have to do this again anytime close to soon :help:
    If I didn't misread your post above, you mentioned that you're planning on using the GenX pump on the 2 spraybars right? (removing the 2 spraybars from the Mag7 line, to put on the GenX). If so, the GenX on a closed loop should be able to handle the spray bars just fine. Ideally, you'll want to stagger the hole sizes in the spray bar from smallest to largest at the extremety of the spray bar to get optimal pressure along the whole bar.

    If you're taking the spraybars out of the equation completely, then that means that you'll have 2 outlets putting out about 600gph. Again, I'm not sure what size tank you have, but you would always use a larger diameter pipe for the outlets so as not to get so much pressure. If it's still too much pressure, you can simply adjust flow by slightly closing the ballvalve on the output side of your pump to meet your flow requirements.

    I hope I didn't lose you in that long explanation... If you have more questions don't hesitate.
    I am Homer of BORG... Prepare to be..OOOO!! DONUT!!!!!!

  10. #10
    Senior Member Cake Fan's Avatar
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    Thanks that helps a lot but I didn't explain something properly about the existing system.

    The return pump goes up to a spraybar (maybe I shouldn't call it spraybar) = a piece of 3/4" tubing that has 4 holes along the way and out of the holes are 4x smaller pieces of tubing, at the end of the tubing are 45 degree angles pointed in different directions (for optimum circulation).

    Now he was planning on leaving the center 2 pieces of smaller outlet tubes and cutting off the other two (making the now 4ft tube into 2 ft with 2 smaller outlet tubes coming out of it in different directions) and leaving this as the return (he thinks there will be enough flow out of those two, I am not so sure of this) AND on the gen x putting only 2x outlets (either end of the tank).

    He wants to do this so that he doesn't have to re-do the return and figures that the mag 7 return (now with a downsized spraybar, but the mag 7 will still have 3.5ft headloss with 3 elbows or so) will give me decent gps and with the gen x on 1" (or should I go for 1.5 for some reason?) he figures I'll have good enough circulation.

    Do you think doing that to the existing (mag 7) setup will give me enough circulation in the middle (with the gen x outlets on either end of the tank) or will I only get minimal gps. Should this be the (it won't work) case I should just bite the bullet and redo the entire return as well as the making the gen x into 4 outlets instead of the 2.

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