From having messed around with it while on the ZEO system, I found color is much nicer once K+ is at the right levels. Once I finally got it within a good range, colors got mush better even though I had thought they were already good before. When I let the levels drop again, color went back to how it was. Many people on the ZEO forum seem to have found the same thing.
Im not sure what it effects for sure (not sure who does) but you may as well keep it at NSW levels. I still test for it once a month now. Its easy to keep levels high once you get them there.
I agree with Jason, it will become way more mainstream eventually.
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