Hi, this is my first post. I've got a large system, 18 stations, drip works fine, but sprinkler pressure is lost after 1 or 2 cycles. I can easily fix the issue by turning off the water coming from the well and releasing the pressure using the ball valve underneath the inlet strainer. I thought this might be a pressure vacuum breaker issue but I just rebuilt it and it should be OK. So now I think it has something to do with the inlet strainer. I have a metal filter sitting in a plastic housing w...