Super large 3" trapway on the Caroma 305 bowl, an inch larger then everything else.
In your situation, I would NOT get the American Standard Cadet, or the Champion. These trapways are too small.
Their trapways are about 2", which for 99% would be fine, but you're a one percenter.
Your best bet is a Caroma bowl, and if you can't get that, you can try the Kohler Highline with pressure assist.
You really don't have much choice.
Yes, there can be a little splash back onto the seat, though most don't seem to notice.
We have been recommending the Caroma bowl for just this situation, and if you are asking if it has been working for them, the answer is yes.
I had one maintenance guy complain that the college where he works, WSU, he's had to fish tennis shoes out of the main sewer line. Kids were flushing shoes down the toilet.
Drain openers that are caustic and not good to put in a toilet. Yes, you may get some splashing with the Caroma, but they will flat flush. It's a trade off. We all look to find perfection, but darn it, it just isn't always possible. Floating around somewhere, probably on You Tube, there is a video demonstrating the Caroma flushing a load of large Russet potatoes! It's almost unbelievable. If I had the problem you describe, I'd get the Caroma and then put the lid down before I flushed. I don't like the pressure assist toilets, they are too loud and they splash too. Moreover, when the pressure unit go bad, it can cost quite a bit to repair.
Terry, in your opinion is the Kohler Highline with pressure assist better than the Gerber Ultraflush for my situation?
Also, a few people mentioned having to drill holes in their bathroom floor in order to install their Caroma and I was wondering what that's all about?
The advantage of a larger diameter trapway is that a stick can go around the curves better. I doubt there is any human that could create a stool large enough in diameter to not make it through a typical toilet...but, when you add in the fact it is long and hard, you need that extra diameter for it to navigate through.
A pressure assist was discussed...I'm not sure that would make much of any difference except add costs and maintenance (not counting the noiser flush). If the trapway isn't big enough, until the stool has a chance to soften by sitting in the water, it's not going anywhere.
This is awkward, but...
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