PS4 Making Micro Bubbles

[rjengen]

So, I have 2 PS4's and one of them is giving me grief. In the start both were making a large amount of air bubbles, I tore them both down though and now it's only my return pump. I know it's sucking air on the suction side, cause I can hear it. I have pulled the pump apart, cleaned it right out, changed the oring seal, put it back together, replaced the suction plumbing, used the liquid teflon, and even changed the sump bulkhead out in an effort to get it to stop. As far as I can tell, I've done everything but I figured I would ask you all...and no they are not comming from the sump...I thought that myself so I tore out the bubble trap and am running socks on the main return, and the skimmer return...it actually got slightly better believe it or not...anyways...any idea's? I may just end up using this pump for my water station and buying a new one.