I have a hayward pro sand filter and hayward heater. My pump when I turn it off to backwash makes this whooshing noise and the water goes out of the pump. Is this normal?? Don't I normally need water in the pump to backwash? I normally turn the pump off, backwash, turn it on to rinse, etc. This new equipment is driving me crazy!! I am not sure if I turn the red big handle that is in between everything off also to domy pool. Can someone help me??My kids want to swim........oh yes, the pressure is up to 20. How do I get it down? I thought backwashing would do that? I cleaned out my filter sock and it had lots of crud in it. The water is clear and my numbers seem to be fine. I have only had the pool open a few days. The noise from the eyeball thing is driving me nuts also.