DualFlush

Dualflush is a toilet flush system that provides two different flush volumes. The smaller option is intended for liquid waste, while the larger is for solid waste. The design aims to reduce overall water use without sacrificing flushing performance.

Most dualflush toilets use two buttons or levers on the cistern. Pressing the smaller control releases a reduced amount of water for a light flush; the larger option releases more water for a full flush. Volumes vary by model and market, with typical half-flush capacities around 3 to 4.5 liters and full-flush capacities around 4.5 to 6 liters. In the United States, common full-flush volumes are about 1.6 US gallons (approximately 6 liters) and half-flush roughly 0.8 to 1.2 gallons (about 3 to 5 liters).

The system is particularly common in Europe and Australia, and many modern toilets include dual-flush as standard. They contribute to reducing municipal water demand and can offer cost savings over time, especially in regions with water scarcity or higher water prices.

Limitations include higher upfront cost and potential maintenance complexities; some users may be unsure which flush to use, and dual-flush mechanisms may be more prone to leaks in seals if not maintained. Retrofitting non-dual-flush toilets is possible but may require compatible components. Overall, the environmental and economic benefits depend on usage patterns and the efficiency of the specific model.