This may sound weird or not, either way I hope someone can help me. I am getting DE back into our pool. We replaced the grids, made sure all are installed correctly, checked the manifold and the air release hose attached in the manifold. Our pressure reads at 15. We've had to remove the DE manually by vacuuming the pool. Until just a few minutes ago my hubby notice that if he DOES NOT closes or tightens the pressure gauge (push up/down kind) completely the flow of DE that you see returning to the pool stops. When i say tightens the gauge, I mean it is close with no water or air bleeding out. Is this part of my issue with the DE getting back into the pool? Or what can be the issue?