i thought 15 is a fairer figure... tbh
i would sell at nearly double that and then some I know how much it earns but apart from that it is the time making it, then pumping it into the van. Pumping takes Time Then the hassle factor.
How long does it take to do this about 15 mins ? what would you earn in that time add the cost of water and time making it the cost of system maintenance.
£15 is way to cheap IMO but if you can get it for that price snap their hand off I know I would