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Thread: Liquid teflon tape

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    Liquid teflon tape

    I called Pentair to ask a question about my filter and the rep told me that it's better and easier to use liquid teflon tape instead of regular white tape for all the male threadings on the filter. Is there a certain brand or type that you all use? I currently have oatey great white. Is that ok? Is that considered liquid teflon tape? Also, if I use oatey great white (assuming that's liquid Teflon tape) should I also use Teflon tape in addition or is that not necessary
    Location: Long Island, NY
    Gallons: 5000 Gallons
    Pool: 15' Saltwater 5000
    Filter: Pentair 1 HP Optiflow Pump w/ Clean & Clear 75Sq Ft Cartridge Filter
    SWG: Intex CS8110

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    CJadamec's Avatar
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    Re: Liquid teflon tape

    Any paste or liquid pipe thread sealant will tell you what type of pipe it is rated for. Read the package carefully and make sure you are using a sealant approved for PVC/plastic pipe. Some sealants contain solvents that will damage PVC/plastic pipes.

    Another thing to be careful of is liquid sealants can make it much easier to over tighten a pipe fitting and increase the risk of splitting the female fitting.
    Chuck-
    15x30 AG, Pentair Superflo VS, 19" sand filter, TF-100 test kit
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    Re: Liquid teflon tape

    Thanks. When you bring the equipment in for the winter and then back outside next spring, do you wipe away the thread sealant and redo onto clean threads? Or do you just leave it as is
    Location: Long Island, NY
    Gallons: 5000 Gallons
    Pool: 15' Saltwater 5000
    Filter: Pentair 1 HP Optiflow Pump w/ Clean & Clear 75Sq Ft Cartridge Filter
    SWG: Intex CS8110

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    CJadamec's Avatar
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    Re: Liquid teflon tape

    Any time you undo a threaded connection you need to clean the threads best you can and reapply new sealant. PVC threads are very soft and can be easily damaged while trying to clean them. That lesson I have learned the hard way. You would be much better off by using unions that seal with O-rings rather than unthreading and rethreading pipe over and over again. Pipe threads are tapered and every time you reinstall the pipe the male end goes further into the female end. Over time you will wear out the tapper of the fitting and be faced with leaks that will never seal.
    Chuck-
    15x30 AG, Pentair Superflo VS, 19" sand filter, TF-100 test kit
    Aqua Comfort ACT750 heat pump / 6x20 ground mount solar panel / DIY automation

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    Re: Liquid teflon tape

    Forgive my ignorance but what are unions? I will be using flexible hoses with hose clamps, not PVC for what its worth

    I will be installing a pentair clean & clear cartridge filter. See below.

    What isn't shown is I will be using a threaded 1.5" adapter that came with the filter.

    Pentair PNCC0075OE1160 Clean & Clear 75 Sq' Cartridge Filter System with 1HP OptiFlo Above Ground Pool Pump
    Location: Long Island, NY
    Gallons: 5000 Gallons
    Pool: 15' Saltwater 5000
    Filter: Pentair 1 HP Optiflow Pump w/ Clean & Clear 75Sq Ft Cartridge Filter
    SWG: Intex CS8110

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    Re: Liquid teflon tape

    Unions are used w pvc to easily connect two pvc pipes or pvs pipes to a filter and/or pump. They can be disconnected by simply unscrewing them for disassembly.



    16 x 32 In-Ground vinyl, 21,000 Gallons, Hayward Cartridge Filter, Hayward Tiger Shark robotic cleaner, Taylor K-2006 Test Kit

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    jasnovanorder's Avatar
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    Re: Liquid teflon tape

    I use the permatex brand. Only reason is because it works on almost everything. So far I have used it on everything from standard household plumbing to cars. Never had a leak yet.
    Intex AG metal frame vinyl sides 10,400 gal. 3000 gph intex pump with 16" sand filter
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    Re: Liquid teflon tape

    Any specific type? Right now I am planning to use teflon tape first, THEN oatey great white on top of that.
    Location: Long Island, NY
    Gallons: 5000 Gallons
    Pool: 15' Saltwater 5000
    Filter: Pentair 1 HP Optiflow Pump w/ Clean & Clear 75Sq Ft Cartridge Filter
    SWG: Intex CS8110

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    Mod Squad pooldv's Avatar
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    Re: Liquid teflon tape

    You shouldn't use teflon tape and pipe dope. Only one or the other is needed.

    Pipe dope is also called thread sealant, pipe joint compound and others. Permatex, Oatey, Loctite and others each have a version. The key is that it is teflon based. Teflon is what is needed to seal the threads.
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    Re: Liquid teflon tape

    I had read on some of the threads people use both with great success. Is there a downfall to using both tape and thread sealer? I've never used tape before and I'm worried that I will do it wrong.
    Location: Long Island, NY
    Gallons: 5000 Gallons
    Pool: 15' Saltwater 5000
    Filter: Pentair 1 HP Optiflow Pump w/ Clean & Clear 75Sq Ft Cartridge Filter
    SWG: Intex CS8110

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    Mod Squad pooldv's Avatar
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    Re: Liquid teflon tape

    It is important to wrap the tape on the threads the same direction that it will screw into the fitting so it doesn't get unrolled and bunched up.

    As for using one or the other or both, that is what I've always heard, use one or the other, not both. I've always used just teflon tape on water lines and pipe dope on gas lines. So, I decided to do a little research and apparently it is just another one of those things where everyone has their way of doing it and they always have because the person who taught them did it that way.

    There doesn't seem to be any downside or concensus that I could find here or on plumbing websites except that if you use both then put the tape first, which makes good sense to me. So, I am going to change my advice to this:

    I prefer to use teflon tape only because it is neater and cleaner and always works fine. Or you can use a teflon based pipe dope. Or if you want to be extra cautious you can use teflon tape first and then a little pipe dope on top as an extra precaution.
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    Re: Liquid teflon tape

    Awesome thanks!
    Location: Long Island, NY
    Gallons: 5000 Gallons
    Pool: 15' Saltwater 5000
    Filter: Pentair 1 HP Optiflow Pump w/ Clean & Clear 75Sq Ft Cartridge Filter
    SWG: Intex CS8110

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    CJadamec's Avatar
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    Re: Liquid teflon tape

    There are some reasons for not using both but for the average home owner they will generally not come across those situations.
    The exception to that is if you are doing work on a gas pipe at your house. Tape shouldn't be used on threaded gas pipe as it can cause havoc with regulators if lil bit get into the gas pipe.
    There was some debate for a while as to teflons roll in the thread sealing world. Tapped pipe threads are well tapered so that as you screw them together the opposing tapers will create a metal on metal seal. Anyone who has split a threaded female PVC fitting knows the power of this tapered fit all to well. The main purpose of Teflon in thread sealers is actually to lubricate the threads so it's easier to get the joint tight enough. Many old plumbers will insist this is the only function the Teflon performs. The current School of thought is that the Teflon will melt under the friction of the threads and help seal minor imperfections in the joint.
    Pipe dope comes in two flavors mostly. Hardening and non hardening. Hardening sealers are generally found in 1000+psi fittings in air and hydraulic systems. You would definitely not want to have tape and dope on that type of joint. Non hardening dope is the most common and with thicken over time but not really harden. Again the primary reason for the pipe dope much like the tape is to lubricate the joint so that you can achieve an interference fit on the threads. Pipe dope more so than tape with fill imperfections in the threads and because it is so viscous act as a seal.
    In general any professional pipe fitter will utter many unkind words about a joint that has both dope and tape on it.

    Finally the pressure of the system, what the pipe is made of, expected operating temperature, and fluid in the pipe must be considered when picking a joint sealer.
    Chuck-
    15x30 AG, Pentair Superflo VS, 19" sand filter, TF-100 test kit
    Aqua Comfort ACT750 heat pump / 6x20 ground mount solar panel / DIY automation

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    Re: Liquid teflon tape

    This is the product I used on my unions for pump and filter - works great - available at big box stores.

    pipesealant.jpg
    38'x16' Fiberglass pool - 3.5' - 8' deep - 19,000 gallons. AutoPilot Total Control SWG (RC-52 cell), Pentair SuperFlo VS, Pentair SD70 Sand Filter, Coverstar Automatic Cover, 10' board, PAL Treo lighting, Polaris 9550 Sport robot, Lamotte ColorQ Pro 7 test kit.

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    jasnovanorder's Avatar
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    Re: Liquid teflon tape

    Quote Originally Posted by pooldv View Post
    It is important to wrap the tape on the threads the same direction that it will screw into the fitting so it doesn't get unrolled and bunched up.

    As for using one or the other or both, that is what I've always heard, use one or the other, not both. I've always used just teflon tape on water lines and pipe dope on gas lines. So, I decided to do a little research and apparently it is just another one of those things where everyone has their way of doing it and they always have because the person who taught them did it that way.

    There doesn't seem to be any downside or concensus that I could find here or on plumbing websites except that if you use both then put the tape first, which makes good sense to me. So, I am going to change my advice to this:

    I prefer to use teflon tape only because it is neater and cleaner and always works fine. Or you can use a teflon based pipe dope. Or if you want to be extra cautious you can use teflon tape first and then a little pipe dope on top as an extra precaution.

    That is what i like about the liquid. No worries about bunching just an even coat on the threads and its good to go
    Intex AG metal frame vinyl sides 10,400 gal. 3000 gph intex pump with 16" sand filter
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