I don't know what thickness this solar cover is, but it's sky-blue coloured & Not see-through.
For maximum heating: Do I leave the cover on, on sunny days, or take it off?

The pool has a twelve foot deep end & the liner is a much darker colour than the solar cover.
I see on-line that some covers work really well as a green house effect, but I'm not sure if mine is one of them.
( perhaps those covers meant to be left on during sunny days are the ones with the silver-coloured layer...?)

Thanks for your help