We just opened our brand new pool Thursday. I was out of town so the PB gave my wife the lowdown..As I arrived home last night she was showing me the bubblers, sprayers ect... When she turned them off the pump started making a strange sound. This was at 8:30pm, dark; so I got a light and checked the filter pressure and it was at 24 psi. We turned everything back on and the pressure dropped to about 18-20 psi. At no time did we turn off the returns. My PB is due out today, so we just left the bubblers going all night. I posted some concern of a 3 h.p. pump being too large a few weeks back, and this is confirming my doubts!! Am I missing anything obvious? It's a 16k IG gunite, 6 returns, 2 skimmers.