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Yes that is open
water... I use 10 ft and 4 ft bamboo poles laid across the
top to support a net to protect from leaves, sticks, etc.
and to keep my tank heaters in the middle. The snow pile in
the middle is what collected on top the cross-over point of
two of the poles. And you can see the "sag" spots were the
the net is actually in the water (well, would you have gone
out to fix it?)
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