When my pool is in normal filtering mode I have water escaping through my back wash line. It just started doing this. At first, I could backwash, switch back to filter and water would come out of the back wash line as well as water recirculating into the pool and also it would send debris into the pool. But if I "rinsed" after back wash it would filter and return properly. Now it is releasing water through the backwash line whether I rinse after a backwash or not. I assume there may be a problem with my multiport valve. Suggestions? Thanks. J