I have an inground return line disconnected after the filter and runs maybe 100 feet back to the pool. I hooked up a shop vac and then a leaf blower to the o-ring union fitting to blow air into the pool (return line), however it didn't reach the pool.... I didn't have any issue with the shop vac last year so thought I'd try a leaf blower thinking that was stronger, still didn't work. Any ideas on how to blow it out? Kinda running out of time here lol I'm thinking maybe there is a air bubble deep in the line??