It seems my bullfrog goes all out of his way to make the water messy. Then again I use strictly Bed-A-Beast because it's safe substrate. Bed-a-beast gets in the water quite liberally no matter how you partition the land/water and no amount of filtration can get rid of the black water after one day of play.
Plus HUGE bowel movements. Big chunks of poo. well, he is a big frog.
I prefer to change a shallow bowel daily, and he does like to soak in there.
Even my pacman likes this setup. He just jumps in and out of the shallow bowel and soaks. It's easy to keep that water clean too.
JadeFox
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Personally, with correct filtration, I would go with the half land half water with a VERY deep water area. When you encounter bullfrogs, the first thing they do is jump in the water. Even with my african bullfrogs and horned frogs I try to create a half water/half land set up. It is not that had if you partition the water off so no substrate can get in (or just minimal amounts) and you have a good filtration system (Canister filters work well and are expensive, but if you are already buying a large tank then it would be worth it). After that, partial water changes need to be done every few days, but the frog will definitely appreciate it. Andy