Ok, here is probably the biggest problem of all.........I don't even know if I HAVE a multi-port valve. LOL!! This filter doesn't backwash. It is a swish-n-bump kind. And I don't know what a spider gasket is. That is not one of the parts listed on the diagram I have of this filter. However, I will be investigating these two things to see if I *do* have them somewhere. Thanks!