Hello, I am new to the site and a first year pool owner. My issue is blowing out the pool lines. I cannot get air out of return lines. I have air coming out of the skimmer and a air compressor attached the the filter. My sandfilter is set on recirculate and still grt no pressure from 3 returns. It's a saltwater pool so I disconnected the salt cell and ran a vac line down the the 3 returns lines that way and only time I got bubbles was after shutting it off waiting 2 min and turning it back on I got a few bubbles. I feel I've tried everything even tried using vac line downvote skimmer line . Any advice would be greatly appreciated I'm trying to save 250 bucks but may bite the bullet and call someone. I'll attached pics of my system