Thank you Tom and JAB. Now I feel confident. Until today I had been using my old meter and boy was it off! I thought I was making 10 ppm when I was actually making 20 ppm. No wonder it took so long to make.
I bought the calibration fluid when I bought the new meter.
I tried just about every distilled water out there and got various readings. Then I tried Mount Olympus. With my old meter nearly every bottle read 0 so I stuck with it. With the new meter it read .2 today before I started making the cs. Not bad, huh.