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Thread: Winterizing bottom drain in Canada.

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    Winterizing bottom drain in Canada.

    Hello all.

    It is once again that time of year. We had a great summer and lots of fun in our pool.
    I am new posting here so I did a search in order to confirm that this hasn't been posted before.

    What is the best way to winterize the bottom drain of a pool? Antifreeze? Is there a way to cover it and drain it? Blow air out of it?

    I am completelty lost and there is not a lot of info i can find anywhere. I lost a pool last year (still not sure what happened)m and I suspect it was the bottom drain.

    Please, any advice appreciated.

    Cheers

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    4JawChuck's Avatar
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    Re: Winterizing bottom drain in Canada.

    I am curious over this issue also, I expect my pool to freeze completely to the bottom (few weeks of -40C temps for sure) and the only thing I could think of that would isolate the bottom drain is a tube extending above the water line that was rubber sealed or gasketed to the drain cover. Once you pumped the water out of the tube water pressure would hold it in place I imagine.

    I could find no information on the web anywhere that addresses this issue, do people actually just fill the line with antifreeze and hope for the best or seal the drain cover and then fill?

    Inquiring minds want to know?
    55 Kilolitre in-ground 18'X36' vinyl lined kidney shape, 1HP pump, Jacuzzi 250lb sand filter, RayPak Delta T 200K BTU natural gas heater. New PoolWerks "Blue Diffusion" liner on May 26th-2011
    Avatar is my pool!

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    Mod Squad Bama Rambler's Avatar
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    Re: Winterizing bottom drain in Canada.

    That's a very good question and I obviously can't answer it.

    I'd think you'd fill the line with -100ºF antifreeze and seal it off.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: Winterizing bottom drain in Canada.

    I also live in Winnipeg. When the guy who does our winterization for us he simply blows air through the main drain for several minutes. Once there is significant air bubbling up from the main drain he closes the valve at the pump to 'lock in the air' in the main drain line. This seems to work fine for us.

    Although it gets pretty cold up here for extended periods I'm not certain if an 8 foot deep pool would actually freeze to the bottom.

    Good luck with your winterization.
    40 1/2 x 20 1/2 vinyl inground - 28,011 gals (~106,000 litres)
    All Jandy equipment
    Aquapure SWG; CL580 Cartridge Filter; 1-AquaGenie, 1-skimmer, 1-main drain

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    4JawChuck's Avatar
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    Re: Winterizing bottom drain in Canada.

    Appreciate your input Snapperhead, I also have a main shutoff at the pump to utilize this method...I guess thats what its there for!

    Thanks again!
    55 Kilolitre in-ground 18'X36' vinyl lined kidney shape, 1HP pump, Jacuzzi 250lb sand filter, RayPak Delta T 200K BTU natural gas heater. New PoolWerks "Blue Diffusion" liner on May 26th-2011
    Avatar is my pool!

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    In the Industry

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    Re: Winterizing bottom drain in Canada.

    The airlock method is the correct way. We use a compressor with an inducer plug then once the air starts coming through we shut the valve. Antifreeze will not help.
    I can always find something to fix on your "perfect" pool

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    Re: Winterizing bottom drain in Canada.

    So antifreeze is useless? That's what my poolbuilder did last year, poured a jug of antifreeze down the main drain (through the pump). Would a 5hp shopvac be strong enough to blow the main drain line?
    19.5k gallons in ground, P4 panel with turbocell SWG, 1hp Hayward superpump II, sand filter, Heater low nox 250k btu heater, solar cover on rocky roller

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    Re: Winterizing bottom drain in Canada.

    I'll put my 2 cents in for the heck of it. I DON'T blow out the bottom drain with air. The reason is because of the unknown torque it could cause on the bottom drain and line in a sand bottom pool. The pool level and the level in the drain line should be about equal with an open line at the pump. If you were there when the pool was built; you should have an idea how the line comes up from the drain to the pump. Mine comes straight up from the deep end to the pump house with no parallel running with ground level.

    I pour 2 gallons of anti-freeze slowly in the open line at the pump house to due the bottom drain line. Anti-freeze will mostly float on water; pouring slowly will help keep it in the line. Then I close the line and also close the valve to the bottom drain so the line is sealed in the pump house.

    Of course, it is the way I do it (not the only way). I'm in growing zone 4b; which is Winter to -25 deg F. I use 22 gallons of anti-freeze when I close my pool. It cheaper than digging up a line in the Spring.
    Hotrod30

    20 X 40 foot vinyl Borates and Salt Pool
    Rolachem Chlorine Feeder
    Hayward 27 inch sand filter with 80 lbs of pea gravel
    Jacuzzi Splash Pak SP55 DE filter in parallel
    Pentair VF3050 pump

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    Re: Winterizing bottom drain in Canada.

    Quote Originally Posted by Hotrod30
    Anti-freeze will mostly float on water; pouring slowly will help keep it in the line. Then I close the line and also close the valve to the bottom drain so the line is sealed in the pump house.
    Hmm the pool store where I attended the "how to close your pool" seminar told us that antifreeze is heavier than water so pouring that in the main drain is useless. I guess I'll have to test this..
    19.5k gallons in ground, P4 panel with turbocell SWG, 1hp Hayward superpump II, sand filter, Heater low nox 250k btu heater, solar cover on rocky roller

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    Re: Winterizing bottom drain in Canada.

    Well, I looked up the specific gravity of Propylene Glycol; it is 1.038. Won't float. All these years I always thought it would float. All these years I knew it would float.


    O'well, I ain't asking about Santa.
    Hotrod30

    20 X 40 foot vinyl Borates and Salt Pool
    Rolachem Chlorine Feeder
    Hayward 27 inch sand filter with 80 lbs of pea gravel
    Jacuzzi Splash Pak SP55 DE filter in parallel
    Pentair VF3050 pump

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