WaterLoo is a patented, easy-to-install and easy-to-use, lightweight and functional smart greywater storage bank to increase your toilet’s capacity for greywater use. It is a non-permanent installation that blends seamlessly with the toilet design, while integrating with the flushing system. Aesthetically pleasing WaterLoo makes it easy to pour and reuse salvaged household greywater, thus saving precious drinking water. At the same time it gives you more space to store grey water for flushing. This means more flushes before having to fill up again, and storing the buckets used for grey water pouring out of sight for longer.