“This action surpasses what the flush mechanism design intended to limit.”
The main reason people complain about the new low water use toilets is because they don’t flush solids completely and require a second flush.
Well as Bob outlined above, its NOT the toilets fault, its USER error due to not familiarizing themselves with the proper use of these “new fangled” toilets.
Ya need to hold the handle DOWN until the brown has gone down! If you do this the 1.6 gpf toilets flush just as effectively and fully as the old fashioned 3.5 gpf toilets.
We had both of our toilets replaced with 1.6 gpf toilets 12 years ago and have never had any problems with them flushing fully and completely.
Eddie