Um, you're still doing the CH test wrong.
1) You MUST use the 25 ml line. It's the FAS-DPD test that you do to the 10ml line
2) Not sure what purple means...you may have no CH, but I won't swear to it.
3) If you added 25 drops of R-0012, that means you have CH of 250, not 500. But if you did it with a 10ml sample of water, I don't know WHAT the heck it means!
4) On your FAS-DPD test (FC/CC) use the 10ml line and each drop counts for .5, not .2. It's good enough.

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