I stuck my shop vac into the skimmer to blow it out to the filter. I had a DE clog in there because of adding too much without making the "DE slurry". If you have a clog in the line between the skimmer and the pump, maybe a shop vac will help you too.

Also - I figured this out b/c I turned off the skimmer input line and only used the bottom drain line. Guess what - it didn't have the flow issue. So, it was something in between the skimmer and pump. I was just glad it was a clog and not a water leak!