I changed the filters on my R/O systems yesterday, including the membrane for the first time. When I was done and turned on the water, I had forgotten to open the take valve and drained all of the watter out of the line and it quit working. I was able to get to going again by puming some more air into the tank, but now it's stopped working again.

I've tried siphoning water up to the line that runs to the sink, as well as putting even more air into the tank, but I can't get it flowwing. Does anyone have any suggestions on how to get it running?