Nelson, my equipment is perfectly fine however using plain RO water is highly corrosive for an espresso machine, especially copper, and you would need to re-mineralize it as it's lacking some important minerals. Since it's lacking minerals it can also mess with the autofill mechanism from your machine. Same with softened water, it needs to be adjusted. Without going into too much technical mumbo jumbo just Google for the SCA ideal coffee standards. Does that mean you have to follow those guidelines. Hell no, you can use whatever water you want and whatever makes you happy. Since you mostly do Cona I believe you don't have to worry ;-).