£15 for 400 litres are you kidding thats a very good price! And so is £18 for 1,000 litres.
Think about it! How much money can you make with 400 litres?? Loads!
I am after a bigger system soon, and if there's someone selling pure water at around that price nearby I'm gonna take it.
Saves you faffing around at home, filling overnight, water bills, everything. Okay, it might not be as cheap as having your own garage system, but what about folk who live in flats, only work part-time etc.
I love this idea, and I would not mind paying £15 for 400 LTRS no way, thats an absolute bargain.