Hello, I have been messing around with my pool lines and have finally figured out I have large rocks in the lines. I just had the pool redone this past fall and everything pressure tested fine but when running the skimmer it would lack pressure and would appear to suck alot of air and lose water in the pump catch. I could not run full skimmer, I would have to run 50% bottom and 50% skimmer. I could vac. with that but it was not real impressive on performance. Upon further checking I noticed today that there is something which I assume is rocks in both the main drain and skimmer lines. When switching the directional control valve at the pump real fast I hear the rocks trying to move up and down the pvc pipes. I dug down to the first 90 degree fitting which is about 4' down. I am trying to avoid replacing the lines there cause I got to drain some water from the pool to work on it then. I did cut free the lines from the pump but so far I have been unsuccessful at creating the pressure needed to blow the rocks out. Is there any special ideas I could do? I was considering hooking up a hose between my cut pvc lines and the filter and seeing if I could not get the rocks up into the hose. Other then that I would need a much larger pump in order to bring the rocks up a 4' 90 degree pipe. Any ideas would be helpful. Will start messing with it again first thing tomorrow morning again.