Yes you can if you have power.my set up is this. 100litre water butt with hoze lock water butt pump in butt,connected to RO unit , from 3 filters in RO go to booster pump for delivery to do resin container and from there to tank or barrels.IN my garden have water butts that I top up my water butt in garage with ,the waste water goes back from RO to garage water butt ,in effect I'm recycling the water but keep in mind my tads from rainwater is only 30 ish. AS the water goes down in the garge water butt I replenish from garden butts ,result ,no waste water which I hated on mains system and very green! The water butt pump is 300watts per hour so it not costing much leccy wise and all the water comes off my roof although I can switch to mains in garge if I need to.this is small scale operation but no reason why you couldn't have bigger butts(!!!!) in garge and garden.THis doesn't t seem to affe t memebranes as been in for ages .,probably over a year. Now but don't forget it's rainwater I'm recycling not mains ,my mains is 350 dd which I reckon would goose membranes doing this method very quick.I like no waste but when IV been doing this for a week or so I drain garge butt as tads gets up to 100 or so .