That well known couple, Joe & Vicki Kieva, who write contributing articles for a number of RV publications recently described a simple test they performed using a number of different types/brands of T/P's. They put samples of each, with water, in equal sized tupperware containers and placed them on their shower floor to duplicate the slosh action in the holding tanks as they drove down the road. Some broke down marginally faster than others with the so-called (IIRC
) RV brand being the slowest.