bubbles down
The bubbles go down on to the waters surface.
down
The bubbles go face down on the solar cover because when the sun hits the smooth side if the cover it warms the bubbles up on the other side & the bubbles on the solar cover holds more heat than the smooth side
Bubbles down
The bubbles need to go in the water, facing the bottom of the pool.
Impurities such as oils, greases, and dirt can impinge on foam bubbles, breaking down the foam blanket and reducing its effectiveness. These impurities can require longer discharge times to fully suppress the fire and may necessitate the reapplication of foam to maintain its effectiveness.
The smooth side of a solar pool cover should face down toward the water to help trap heat and prevent debris from entering the pool. The bubbles or air pockets on the cover should face up, as they help to capture and retain heat from the sun.
Personally, I disagree with the logic used by those above. If the bubbles are up, there will be larger surface area to absorb the sun's heat. Increased levels of heat absorption seems more important than the rate of heat transfer, especially when considering the fact that heat transfer takes place almost instantaniously.****i have tried it both ways, bubbles up or down. makes little or no difference heating. with bubbles down, though, it is easier to clean debrie off the cover and keep it clean.
All Solar Pool Covers are placed on your swimming pool with the bubble side down, or facing the water. This allows an air pocket to form under the cover to trap heat & provide the maximum insulation value the cover is designed for. -Charlie Goss President DPD Pools / PoolDeals.com
So long as the blanket doesn't interfere with the flow of water it doesn't mater when you run it.
Personally, I disagree with the logic used by those above. If the bubbles are up, there will be larger surface area to absorb the sun's heat. Increased levels of heat absorption seems more important than the rate of heat transfer, especially when considering the fact that heat transfer takes place almost instantaniously.****i have tried it both ways, bubbles up or down. makes little or no difference heating. with bubbles down, though, it is easier to clean debrie off the cover and keep it clean.