It is a possibility but rainwater is more of precious commodity over underground water at our farm. In saying that the tds of the bore water is 500ish, reef pure said their 5 stage will do it but at the cost of needing to service and replace the resin and membranes every 3 to 6 months. But that's really the same cost as the 250km round trip to get the nsw and rodi that I currently do at the momentRodi and Asw..........iffff your TDS with well water is not going to burn through di resin like no tomorrow! If it does, can you produce rodi from tank water instead? I would imagine the starting TDS may be much lower than with well water.