So I'm now running almost 100% WFP for my upstairs work - bar flat roofs etc but that means I'm now using about 6L of resin a week with my Unger HiFlo DI filter (1 replacement bag a week - it's giving me about 450-500L of pure water per change) I've been browsing online but am a little confused by installing an RO filter at home - obviously will save me £110 a month on resin but I'm confused how it 'works' without a van?... How do you hook it up? Does it have to be plumbed into your main water? I'm only renting so I don't want to start building it up under the sink. What I would ideally like (if it's even possible) is to be able to just run an EZ snap or hozelock from my kitchen tap into the RO filter then back out the other end into the DI filter when I need to fill up my barrels and then unplug and put it back in the cupboard when I'm done. Guess the burning question is, can I do this?? Or am I stuck just smashing through the Unger bags until I can build up a water butt and plumb it into the mains water?