This reply may be a bit late for you, but here it goes.

Do you know what's blocking the skimmer line? More specifically, do you know for sure that there was some way for an extraneous object to get into the line?

I am asking because I had a similar problem, but I finally discovered that the flap in a check valve on the skimmer line had broken loose and was blocking the flow. The valve, I think, was there to prevent backflow from the dirty side of the filters into the pool when the solar panels are emptying.

There was no simple way for anything else to get into the line.

Good luck.