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Thread: Can I leave the winter cover on in MN until it gets warmer?

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    Join Date
    Jun 2012
    Location
    Blaine, MN
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    106

    Can I leave the winter cover on in MN until it gets warmer?

    We still have our winter cover on. We siphoned most of the water off the cover. Yesterday I hooked up the pipes to the pump/filter so I could bring the water level back up. Slipped my hand under the cover (there's a gap because we couldn't get the wire any tighter). Here are my results with 2-3 more inches of water to add yet:

    7.5 ph
    15 fc
    .5 cc
    14.5 tc
    140 ta
    70-80 cya
    56 temp (dang that's cold)

    I know the temp was closer to 70 before I started adding water. Is it feasible/advisable to keep the cover on until the water gets closer to 70? I would keep an eye on the chemicals and start running the pump/filter today or tomorrow if you think this is a good idea. I am so not looking forward to our weather forecast of "rain/maybe we'll hit 75" one day next week.
    blondemarcello
    18x33 16,700 gallon AG
    Sand, TFP Test, Gas heater
    Minnesota

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    JasonLion's Avatar
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    May 2007
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    Silver Spring, MD
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    37,879

    Re: Can I leave the winter cover on in MN until it gets warm

    It is best if you can open the pool before the water gets to 60 degrees. You can put it off longer than that, but the odds that algae will get started go up quickly as the water warms above 60.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Jun 2012
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    Blaine, MN
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    Re: Can I leave the winter cover on in MN until it gets warm

    Quote Originally Posted by JasonLion
    It is best if you can open the pool before the water gets to 60 degrees. You can put it off longer than that, but the odds that algae will get started go up quickly as the water warms above 60.
    Do the odds for algae increase because I wouldn't be able to brush thus not able to "stimulate" the water?
    blondemarcello
    18x33 16,700 gallon AG
    Sand, TFP Test, Gas heater
    Minnesota

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    May 2013
    Location
    Long Island NY
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    419

    Re: Can I leave the winter cover on in MN until it gets warm

    I still have my cover on in Ny. But my pump is hooked up and I run it every day for 4 hrs.

    I also put a little chlorine in and I keep a close eye on it everyday.
    19,000 gal - Vinyl IG - Sand filter -1.5hp. - Taylor k 2006 - Loop Loc cover

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    Smykowski's Avatar
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    Sep 2011
    Location
    Gurnee, IL (North Suburban Chi-town)
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    3,065

    Re: Can I leave the winter cover on in MN until it gets warm

    Quote Originally Posted by samt
    I still have my cover on in Ny. But my pump is hooked up and I run it every day for 4 hrs.

    I also put a little chlorine in and I keep a close eye on it everyday.
    This is exactly what I'm doing as well. Cover will come off next week.
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
    The most important article on this site - The ABCs of Pool Water Chemistry

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    pwrstrk's Avatar
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    Aug 2012
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    Elverson Pa.
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    Re: Can I leave the winter cover on in MN until it gets warm

    I'm doing the same thing also. I check FC level every other day and run pump for 4 hrs. I'll be taking off as soon as all the seed pods are off the maple tree. I don't need a pool full of
    those things.

    Water temp was 72 on the bottom when I checked the other day.




    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    linen's Avatar
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    Jul 2010
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    Twin Cities, MN
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    Re: Can I leave the winter cover on in MN until it gets warm

    Quote Originally Posted by blondemarcello
    Do the odds for algae increase because I wouldn't be able to brush thus not able to "stimulate" the water?
    I don't think that really matters. Basically, algae growth rate increases with temperature. Most likely over the winter your FC level went to 0, so once algae starts to grow, there is nothing stopping it.

    If you can get some chlorine in there and circulating like mentioned above, I would.

    By the way after fixing the leaks in my solar panels today, our water got up to ~64F this afternoon.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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