[welmac]

you can run the waste water back through, you could run part of it through, you could mix it with rain water, but the thing to remember is the higher TDS water you put through the sooner filters need changing.
alot of units do recirculate some of the waste water anyway. but no matter what you do, you can not have a zero waste RO unit, the process needs waste water!

[p1w1]

i'm with you now welmac and what you say makes sense i guess i was hoping for a fairly easy solution but at the end of the day it is how a ro system works and there really isn't an economical way round it.
Thanks for your input mate.

[welmac]

i'm with you now welmac and what you say makes sense i guess i was hoping for a fairly easy solution but at the end of the day it is how a ro system works and there really isn't an economical way round it.
Thanks for your input mate.

no problem!