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Hah. I tried doing some research about what this kind of drain is called, but I have no idea. I’ve never had a drain like this before, but I guess it must not be too rare?
In my case, the issue is that it starts to stink a lot. We had a plumber out a few years ago, and he opened that thing up and used a plunger to remove a ton of hair. He then suggested we wash it out every now and again, but I haven’t been able to do it for a while now, since I can’t get that thing open.
I had a similar question a while back and ended up with Voip.ms.
https://discuss.tchncs.de/post/2418116