Should you leave the vinyl pool cover on when using a solar blanket or does the pool cover above the solar blanket hinder the solar blanket's performance?
Remove the vinyl cover when using a solar blanket to warm the
water. If the vinyl cover is used at the same time as the solar
blanket, the vinyl cover absorbs most of the heat and then
transfers the heat into the air or water between the vinyl cover
and the solar blanket. Then the heat transfers to the solar blanket
and then, finally, into the water. When this happens, a lot of heat
remains in the vinyl cover and air/water between the two covers
instead of getting into the water. It is preferable to have the
heat absorbed by the solar cover and then transfer directly into
the water. Hope this helps...
Too much redundancy in pool covers.