The contents of my filter seems to be backflowing through to my skimmer and out through my drain when the pump turns off. Does the multiport valve have a backflow control? There is always a little bit of water in my waste drain pipe so I think there could be a leak there none-the-less. If it's damaged, can I open it and replace the parts without tearing up all the PVC?
If a backflow leak is suspected, is there any means to test that aspect of my system?
I have a Nautilus FNS filter, and the main multiport valve was made by praher in Canada.
Thank you, thank you very much.