If you're finding the small flush isn't evacuating urine, you may need to adjust the flush it's really easy to do, just twist the knobs under the lid it's in the manual.
As others have mentioned, my Cadet3 can flush away poop on the small flush. The Cadet line is rated a MAP1000; one of the strongest flushes on the market! It can flush one dozen golf balls on the large flush setting! -- "All opinions stated by me are solely my views and do not reflect the views of my employer, this site, or even myself depending on my level of sanity at the moment"