+1 been there done that won’t try again. RO got my water down from about 20 degrees kH. I was able to get great growth on most plants with the high kH and CO2 as well before I went RO. But some plants just wouldn’t take
R.O. does sound like a more stable way of doing it than using peat. I'll see how the plants do. I've got easy plants (according to Tropicas rating system), so hopefully that means they aren't too sensitive to water hardness.