Although there's nothing like the real thing, some imitations are better than others — especially when it comes to low-flow flush tests.

While previous toilet trials used sponges, plastic balls, and construction paper as test media, a recent study by Veritec Consulting and Koeller & Co. used extruded soybean paste and wads of toilet paper — arguably a more accurate replication of the real demands on a toilet. The researchers assessed more than 90 models that meet minimum...

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