Up until now the water I've produced has gone into my van after the resin chamber attached to my R/O; so it goes in at about 000 TDS.
As I am supplementing my water with rain water at about 020 TDS I am thinking of ways to bring the TDS down to 000 before the van tank or should I do what "everyone" else does and have my resin on the van?
If so, what size and weight of bottle do you recommend, bearing in mind that I have a 400L tank and will only put 000 to 025 in the van?