I was wondering the same thing. We have gray and they find it if there's any amount of water in it.Maybe your tarp should be green in color, like grass?
My "experiment" is not working either. I tried putting the leaf net up to see if they would avoid the pool. but they seem to still see the water and drop poop where they sit on the rail. Its not as bad as before and I haven't seen big sacs. At least they can't swim in the cover and turn it into the usual "roman bath".



Cleaning the net on our pool will not be easy. So much for my experiment. Back to the drawing board. In the past couple years, we started scrubbing and rinsing the cover before we removed it off the pool. It was so much easier since we have very little area on the ground to lay out the cover, scrub and not kill what little grass we have.
That is definitely a big WIN!What it does is make clean up a breeze and it keeps my safety cover clean. A quick wipe with a towel wet with Chlorox clean-up and it comes right off, no scrubbing required. That surely was not the case when it hit the pool deck, diving board or my pavers last year!

It's disappointing, thinking swimming might not happen till June.

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