If you have the salt system, I'm not sure why you'd want the Nature2--the salt system will maintain adequate chlorine levels without it, so why go to the added expense of the extra cartridges and system? The salt also will will make the "feel" of the water softer, so the Nature2 won't help in that regard.

I don't have a Nature2 and have no practical experience with it, but I have been a mod on this forum for over 6 years and can tell you that we've had poster after poster come here after using the Nature2 systems for awhile for help with dealing with metals in the water. So before you decide to go that route, take some time and read through the metals forum so you know what you're in for once you get copper in you water, and THEN decide whether you want to go that route or not.

Janet