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The Plumbing Efficiency Research Coalition (PERC) has published a Phase 2.1 supplemental report on the drainline transport of solid waste in building drains. The report focuses on two previously unaddressed areas of study — the implications surrounding dual-flush toilet discharge patterns, comparing results to single-volume-flush toilets of comparable flush volume, and on the impact of drainline slope deviations on the transport of solid waste. Click here for more information.