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re: well when should i take my pool cover off??!!
9 oct 1996
andrew mckegney wrote:
>>>...most pool owner really don't want to look at them.
the eyes want to look but the body does not?
>>perhaps that would change if they looked like a slate patio.
>perhaps, but they would not like trying to remove them !!
perhaps you have not had time to read the 10 lines you quoted below.
>>here's another recipe: make 1 picture-frame mold out of 2x4s on edge with
>>a 4'x8' id, and put a $16 4x8x2" styrofoam panel inside and place 1.5" of
>>concrete on top of it, and push a 1/2" diameter hole diagonally through each
>>corner of the concrete, so you can tie these slabs together later. repeat
>>26 times. make the perimeter slabs with cedar strips and plated screws to
>>hold down a single $40 24'x36' sheet of 6 mil poly film, on top of the cover,
>>and inflate the film slightly to raise the cover and make a 768 ft^2 solar
>>collector, and lower it 2" every so often, letting some water leak in around
>>the lower film edges, using a thermostat, automatically, to remove the solar
>>heat. you can't walk on this, but it would keep the pool warm in december.
>it "might" (highly unlikely) keep your pool warm, but i don't know of
>many people who ae going to want to shovel the snow off the cover
>before they sink it
those pool owners might prefer the inflatable version, described in the
10 lines you quoted above (note the plastic film should terminate below
the water line, to make a dry floor and a good air trap) with the oblong
poly film dome 12' high in the middle, and the inside of the north half
of the plastic film painted white to reflect more sun down into the water
on top of the cover, during the day.
should we inflate the cover with grainger's $60 1" 140 cfm 100 watt blower,
the one used to inflate greenhouse poly film pillows? or the leaf blower
that sears hardware is now selling for $49.95 (8.5 a 110v, 340 cfm at 150 mph)
we might make a pressure switch with a manometer and a floating magnet and
reed switch. or find a 13 year old science fair student or a serious solar
pool heating professional to solve this pressure control problem. another
cordless 12 vdc (allowing easy backup power) 16 a version blows 70 cfm at
110 mph, which might raise a 24' x 36' slate pool cover from the bottom in
2 minutes, or turn on for a few seconds every 4 hours to keep it afloat.
their $69.95 wet/dry shop vac might make a good bubble generator, with the
vacuum hose connected to the top of the cover and a bubble sensor to turn
the vac on when there are no bubbles at the top.
use some imagination, andy.
>with your imaginary r10 blanket that magically appears and dissappears
>from the pool surface without any effort by the pool owner, things
>could be even better. but then this is pure fantasy.
like telephones or moonwalking or wireless electronic doorbells or plastic
film greenhouses? perhaps you imagine skyscrapers and airplanes are built
by trial and error :-) some things are fairly predictable. like you.
nick
wise men learn more from fools
than fools learn from wise men. --fortune cookie
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