Device could save 75% of water used around the house, expert claims

Flogenic is a float valve which can be fitted to a tank and uses water purification tablets to sterilise water. This means water harvested from rainfall can be sterilised to such a degree that it can be used anywhere in the house, for baths, showers, or even as drinking water.
Previously, rainwater gathered from a special tank in the garden was only suitable for use in toilets. As such, the method did not gain widespread popularity — people could not justify going through the procedure of getting a rainwater tank and pumping it all the way up to the attic just to save on the amount of water used when flushing toilets.