Toto Neorest 550H Toilet Toto's new Neorest 550H is a remarkable combination of ecology and luxury, designed to meet the demand for elegant products that also conserve water. This ultra high-efficiency toilet offers a new gravity-fed, dual-flush Cyclone system that consumes just a gallon or less per flush. Its integrated personal cleansing system also disinfects the bowl and reduces the need for harsh chemicals during cleaning.