Re: Litter box in the bathroom
Both our boxes are in bathrooms. We use Tidy Cat for Multiple Cats and have very little odor (fresh poos which are poorly covered still smell, obviously).
It is a clumping litter, and we scoop into a Litter Locker (like a diaper genie) twice a day.
Mind you, the bathrooms have a good venting system, and since we have no one else but us in the apartment, we don't close the doors very often.
I'm wondering if it isn't the cat, has he been checked by a vet recently for urinary issues?
As for the poop in the tub, hey, at least he did it in the tub where it is easy to clean!