Cadence One is a gravity-fed toilet that uses only 1 gallon of water per flush. The WaterSense-certified unit features a fully glazed 2 ?-inch trap and a glazed, non-staining, anti-microbial surface for a cleaner bowl. A model that uses 1.28 gallons per flush also is available; Both come in white, bisque, and black with various metal finish options. Cost: $465. ICERA Group. 855-444-2372.www.icerausa.com.