Has anyone tried taking a 4x8 or 4x10 panel (like Fafco or Vortex), and laying it a hot concrete deck, running the inlet from a return, and outlet back to pool? Most of my pool is shaded, but the deck gets lots of sun all day. City won't allow permanent installs. Just curious if I could get 3-5 degrees using one panel, running when pump is running. Solar blanket at night. I see all the small round tube types, and small square ones, but a 30'-40' panel would probably be much more efficient than any of those. A 4 x 8 would be easy to mount on plywood, move around easily, and tilt at "prime" angle each month.