Hi all, I have a bit of a mystery on my hands. My tap water TDS is at 136 ppm. GH is at 8 degrees and KH is at 7 degrees, PH is 7.8. These results were achieved with API Test Kits (and a TDS meter). I made RO water with my new unit (RO Buddy), and now the TDS meter reads 001 ppm, PH is 6.4, but I can't get the KH or GH to change colors. I stopped at 13 drops each. All it does is deepen the original shade, it doesn't change over to the 2nd color. Is this because there is no GH or KH in my RO water? Or am I doing something wrong?