Just out of interest really but why are you going to buy a second RO system?
im not m8, im gonna take the RO system out of the van and use that alongside a 2nd 4040 filter.LOW PRESSURE
Probably my post is missmessaged m8.
i intend on having a 2x 1000ltr ibc'slinked and set up with 2 x prefilters 20" and 2 x 4040's then 3 x di vessels to recirculate the resins. ( because i have them )
at my last reading of tds via 3 individual di's , 1st was 6ppm, 2nd was 1ppm, then on last di it was 0ppm.
, so i will fill the 1st one up with new resin when the last one rises and put this as the last one. =0ppm = reusing perfectly good resin .
then transferred to the vans via transfer pump.
hope this makes sense m8

i currently got a 650ltr tank in the traffic and intend on uprating that to 1000ltr and moving the 650 ltr to the new van for me to conduct oneoffs and first cleans only.