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Thread: Question About Trapping Air in Bottom Drain for Winter

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    Question About Trapping Air in Bottom Drain for Winter

    I am slowly picking off the winterizing steps for my pool. I have had a cover over it for a week and drained the equipment, now I am blowing out the lines. When I set up the plumbing, I brought the skimmer and bottom drain lines into a 3-way valve and then through a check valve into the pump. I blew out the skimmers to the pump no problem, but to blow out the bottom drain I had to get creative. I was able to open the check valve with a wire and then hook up a line from my compressor to blow them out. I had air bubbling out almost instantly so everything looked great. I shut off the air and switched the 3-way valve to block the bottom drain and pulled off the fitting I use to hook up the compressor and I could hear the sound of air bubbling by the valve. The Jandy valve must not be able to stop air flow in the reverse direction. With how they are mad, it makes sense because with water trying to flow through it the correct way, the water pressure will help to seal the valve shut but in reverse, it isn't really built stout enough to seal.

    I ended up capping the line where it connects to the pump and plugging the skimmers threaded plugs but I imagine it will leak enough somewhere to let the bottom drains fill again. Should I cut up the bottom drain line and install fittings to cap it more securely or is what I have done so far likely to work?
    DIY 28x38x18 Full L, 26,000 gallons, Pentair VS Pump, SWG, CCP 420 Filter, Sta-Rite Max-E-Therm SR400HD Heater, EasyTouch Controller

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    Re: Question About Trapping Air in Bottom Drain for Winter

    yes, cut the main drain line before the check valve and install a glue union. Most people do winterize their main drain by simply closing a valve while blowing through it but sometimes (like in your situation) you can hear the fizzle of air leaking past the valve. Anyways, once the union is installed (hopefully the main drain isn't plumbed in a way where it wants to leak water as soon as you cut into it). You would basically blow through the union and quickly cap it off with a rubber compression plug (typically a #8 rubber plug, sometimes #9 for 1.5 plumbing) If your compressor setup doesn't allow you to quickly stop blowing and cap within a few seconds then you might want to just purchase as blow through plug. This rubber plug gets tightened into place and it has a valve step on the plug (like you'd find on a car tire) you blow through that and your done. It does come with a nylon cap to back up the seal.
    -Kevin
    X-Pert Pool Service
    x-pertpool.com
    X-Pert Pool on Facebook and @XPertPoolServic on Twitter
    22,000 gal / 16' x 32' / Vinyl / Hayward s244t /Pentair SuperFlo 1 hp

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    Re: Question About Trapping Air in Bottom Drain for Winter

    Thanks for the reply. I had decided to install a union to separate that section because I wasn't comfortable with it how it was. I'll try using a plug.
    DIY 28x38x18 Full L, 26,000 gallons, Pentair VS Pump, SWG, CCP 420 Filter, Sta-Rite Max-E-Therm SR400HD Heater, EasyTouch Controller

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