Skimmer works for 5 minutes and then stops. After backwashing it works for 5 minutes and then stops. Gauge starts at 10 psi and when it gets to 15 psi it stops, usually in 5 minutes. No bubbles in basket or coming from the jets. BUT when I recirculate all is fine for the entire day. So does this mean that the pump is working fine, hoses and skimmer is not clogged or sucking air? Installed new grids today (had holes in them and pool was full of DE). No leaks at filter cover and gasket is clean and lubed. I don't think I have any blockage because it works fine for 5 minutes (the barracuda is pounding /pulsing away). Any ideas of what causes the suction to decline to nothing after 5 minutes of operation.