Hello all. Been at this about 8 months now and starting to fill my days with around 10-15 houses per day (all different shapes and sizes). Currently I've got a 350 litre tank in my van which I very rarely empty on a days work except when doing lots of first cleans or nasty upvc when there's no garden tap. I've been using two 220litre water butts for storage in the back garden and pumping to the van through a hosepipe which I run through the house (its a terrace with drive out front). I'm starting to get sick of the hosepipe through the house for half hour a day and the kids messing with the water butts so now I'm looking for a better way of storing/transfereing the water and came up with this.... Fit a 100 Gallon (450 odd litre) potable cold water tank in the loft (the coffin type with lid, you can get them from screwfix, aswell as the existing one for the house supply) run the tube from the ro upto that with a ball valve and overflow and gravity feed from that down to a tap on the front wall of the house or even move the ro etc upto the loft with the tank and run the waste into the soil pipe. I'm pretty sure I can make it work, just seeing if anybody has any reasons not to do it this way??? What worries me is the extra weight in the loft and if in the future I need to store more water.... Sorry for the massive post and any thoughts much appreciated. Thanks Luke.