🤯 you just blew my mind with that possibility.

When I put the pop-up stopper in, the drain flows much slower than without it. And! Without the pop-up stopper installed, I’ve never had the smell or slime. I hadn’t put two and two together.

I guess what threw me is that it’s happened with two separate (but similar) drain assemblies. Maybe I’ll try installing a grid style assembly. That might do the trick.