Tips, suggestions on what type of solar cover to buy & where?

[MTU 5.0]

Thanks for the responses. A couple more questions though......

How big are your covers and what did you pay?

[CarlD]

OK, ALL solar covers will warm the water in sunlight--and all will insulate at night.

But my experience has been that the clear, heavy-weight covers do best. They pass the most light, and they insulate.

Opaque covers work by conduction, but transparent ones work by letting the light heat the water directly. More like a true greenhouse. There are also blue transparent covers. They don't work as well but look a little nicer.