How modern toilets balance extreme water efficiency with actual flushing performance

Testing the Newest Low Consumption Toilets | Ask This Old House · 8:24 · Video: This Old House · Watch at the source

In short: Plumbing expert Richard Trethewey visits a New Jersey facility to examine the rigorous engineering behind low-consumption toilets. Discover how manufacturers ensure that reducing water usage does not sacrifice a toilet's ability to clear waste or keep the bowl clean.

To achieve water efficiency without compromising functionality, new toilet designs undergo a multi-stage testing process. Engineers first develop prototypes to verify water consumption metrics before constructing full-scale models for performance evaluation.

These models face a battery of tests designed to simulate real-world usage. This includes measuring the distance waste travels through the plumbing, assessing the volume of material—both large and small—that the system can successfully flush, and confirming that the bowl remains sanitary after each cycle.

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