[Salmon]

the Aqua trolley comes with ' D.I unit or 4 stage RO unit ' so would I need to bother with an RO in situ ( as I was going to get in house) if his trolley has one??

Or Should I still get the RO in situ and then the trolley with the DI unit not the trolley with the RO???

I am in a hard water area.

Presume this would mean cost of trolley  with DI AND  seperate RO system

Thanks