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Fluidmaster, Brasscraft, and Hydroclean are all the same basic design though.

I'd get it turned off at the street and replace it with a ball valve.

Is the garbarator new? Did someone forget to knock out the knock-out? Is the drain piped directly into the continuous waste? Do the sinks drain normally?

The first thing I would do is get a plumber out there to do what's called a hydroscrub or hydroflush (most franchised outfits will be set up to do it).

The gunk from the shower drain is from hair...