230 is pretty high. If its just calcium, I would think a decent filtering system would remove that without having to go all the way to RO filtering. But what else is in the water that might get by a standard filtration system. I understand that the RO systems waste a lot of water because of how they work. If that isn't a problem for you then I would stick with the RO. But if the waste is costing you in any way then I would get the water tested and see if it can be corrected with a standard filter system, and if it would be more cost effective to use