I have a TF test kit and have a question about the Calcium Hardness test. The video instructions post a test with 25ml of water/20 drops r-0010/5 drops r-0011...this is the same instructions as the old Taylor kit I have. The printed instructions says 10ml water/10 drops r-0010/3 drops r-0011. I get somewhat different results when I do it the different ways (320 the first way and 410 the second way). Which is the correct way to do this test?