Installing high-efficiency, low-flow toilets in your home is just one way you can lower conventional water use. By consuming less water with every toilet flush, you benefit not just the environment, but also your wallet. Low-flow toilets are designed to consume as little as 1.1 gallons of water per flush (GPF); compared to the old-school toilet models (commonly in homes as little as ten years ago), this is a revolution in water consumption.