An average person in the UK uses 140 litres of water per day. That may seem like a lot, but when you consider our everyday uses such as showering, bathing, toilet flushing, washing dishes, washing cars, watering gardens and of course drinking, it all adds up. But out of those 140 litres you use, how many of those do you drink? Doesn't it seem like a waste to treat water to drinking quality j....