Water draining from my Filter when pump is off

[Poconos]

I think you have a good handle on the problem and agree with your diagnosis and solution. Not familiar with those valves but don't think there can be another source of the leak. All the symptoms point to that. Multi-ports do the same thing when the gasket goes bad. That problem I have had.
Good Luck.
Al

[mphare]

Thanks! This weekend it should be warm enough to go out and try to replace them.