Our new to us pool is almost finished filling. We don't know how to work the pump and filter. It is a sand filter and when it is set to filter and we turn the pump on it and things start running and water starts coming out of the waste line. When we turn the filter to backwash, water rushes out the waste line. The only time we can get it so water is not coming out the waste line is on closed with the pump off. What are we doing wrong? Thanks!
Also, we can't get a psi reading because the needle on the gauge is stuck behind a pin that comes up at the 0 mark. I think the needle may have bounced over the pin when we were moving everything. ANy thoughts on how to fix that?