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Thread: CoverFree?

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    CoverFree?

    Has anyone used CoverFree? I'm looking for a way to keep my above ground pool warmer without using a solar cover.
    21' Round. Above Ground. Doughboy. Sand Filter. TF-100

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    cowboycasey's Avatar
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    Re: CoverFree?

    it looks to be generally safe, a rating of 1 for health.. you should take a shower after using the pool and it says not to discharge water into drains?? do they know its going in a pool??

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    Re: CoverFree?

    Do a search on the forum for liquid solar covers. At best they do almost nothing to improve heat retention, which makes sense when you really consider it. How well can a thin layer of oil really prevent heat from escaping your pool at night?

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    Re: CoverFree?

    I didn't know it was rated 1 for health! My dogs often float with me and sometimes take a drink of water (even though I tell them no!). Maybe it wouldn't be a good idea then. ?
    21' Round. Above Ground. Doughboy. Sand Filter. TF-100

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    Re: CoverFree?

    Quote Originally Posted by Donldson View Post
    Do a search on the forum for liquid solar covers. At best they do almost nothing to improve heat retention, which makes sense when you really consider it. How well can a thin layer of oil really prevent heat from escaping your pool at night?
    When there is no wind then they DO retain heat indirectly by significantly lowering the amount of evaporation (see this post that shows that 1/4" of evaporation will lower a 4.5 foot average pool depth temp by 4.9F). About half a pool's heat loss comes from evaporation of the water, NOT from conduction or radiation. So these liquid pool covers DO work IF there is no wind. However, that's a big "if". With wind, the single molecule layer tends to get pushed to the side exposing water to be evaporated.

    A bubble-type cover is obviously a lot better, not just because it is not affected by wind, but also that it not only prevents evaporation, but has air bubble insulation that significantly reduces conduction. Whereas a thin non-insulating cover and perhaps these liquid solar covers with no wind may cut down heat loss in half, the bubble-type cover cuts down that remaining loss in half again. So if one were to lose 6F overnight with no cover, a thin or liquid cover may cut the loss down to 3F while a bubble-type cover would cut it down to only 1.5F. These covers also work during the day, but then in addition to heat losses there is heat gain from the sun heating the water in the pool. Very roughly speaking, you can expect a bubble-type cover to raise pool temperature above the average day/night about twice as much as a thin or liquid cover. So instead of a 10-15F increase, you may only get a 5-7F increase.

    I have an automatic electric safety cover and it is relatively thin and not very insulating so in my pool I only get a roughly 50% reduction in heat loss due to preventing evaporation. If I were to use a bubble-type cover, I'd retain more heat, but it wouldn't be automatic. Since I have a solar system to heat the pool, it nets out OK for the convenience of an automatic cover.

    Quote Originally Posted by Tvaughn6 View Post
    I didn't know it was rated 1 for health! My dogs often float with me and sometimes take a drink of water (even though I tell them no!). Maybe it wouldn't be a good idea then. ?
    As for the "1" for health which means a SLIGHT health risk, that is referring to the CONCENTRATED chemical. The 1,2-Propanediol will evaporate (it's just used as a carrier for dispersion), but the 1-Octadeconal (aka Stearyl alcohol) that remains has an LD50 better than table salt. Most certainly when diluted as a thin one molecule layer on the water, it will not be hazardous even if your dog drinks from the water.
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    Re: CoverFree?

    Quote Originally Posted by chem geek View Post
    When there is no wind then they DO retain heat indirectly by significantly lowering the amount of evaporation (see this post that shows that 1/4" of evaporation will lower a 4.5 foot average pool depth temp by 4.9F). About half a pool's heat loss comes from evaporation of the water, NOT from conduction or radiation. So these liquid pool covers DO work IF there is no wind. However, that's a big "if". With wind, the single molecule layer tends to get pushed to the side exposing water to be evaporated.

    A bubble-type cover is obviously a lot better, not just because it is not affected by wind, but also that it not only prevents evaporation, but has air bubble insulation that significantly reduces conduction. Whereas a thin non-insulating cover and perhaps these liquid solar covers with no wind may cut down heat loss in half, the bubble-type cover cuts down that remaining loss in half again. So if one were to lose 6F overnight with no cover, a thin or liquid cover may cut the loss down to 3F while a bubble-type cover would cut it down to only 1.5F. These covers also work during the day, but then in addition to heat losses there is heat gain from the sun heating the water in the pool. Very roughly speaking, you can expect a bubble-type cover to raise pool temperature above the average day/night about twice as much as a thin or liquid cover. So instead of a 10-15F increase, you may only get a 5-7F increase.

    I have an automatic electric safety cover and it is relatively thin and not very insulating so in my pool I only get a roughly 50% reduction in heat loss due to preventing evaporation. If I were to use a bubble-type cover, I'd retain more heat, but it wouldn't be automatic. Since I have a solar system to heat the pool, it nets out OK for the convenience of an automatic cover.



    As for the "1" for health which means a SLIGHT health risk, that is referring to the CONCENTRATED chemical. The 1,2-Propanediol will evaporate (it's just used as a carrier for dispersion), but the 1-Octadeconal (aka Stearyl alcohol) that remains has an LD50 better than table salt. Most certainly when diluted as a thin one molecule layer on the water, it will not be hazardous even if your dog drinks from the water.
    thanks Richard, I saw the "1" and was not sure if it was from the bottle "concentrated" or when deployed in the pool..
    Pool: Intex 16x32 15000 gal, 2 speed 340042, Pentair CC320 Filter, CircuPool SJ45 Salt System, Intermatic PE653RC; Hot Tub: 650 Gal SWG Megachlor
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    Swampwoman's Avatar
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    Re: CoverFree?

    I use cover free and it does in fact do something, though I'm sure not as much as a real cover. On cold, Mchigan mornings, the difference between having topped up the cover free and not is truly visible in the volume of fog coming off the pool! In wind, however all bets are off

    I haven't been expspecially scientific about it, but I know my gas bills were higher before I started using it.
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