I just opened my pool and doing the first set of tests of the year. Everything seemed in order except the calcium test. After adding the 20 drops of R-0010 and the 5 drops of R-0011, I was unable to get the color to change. It stayed red no matter how many drops of R-0012 I added. I added 200 drops and no change. Normally my calcium levels in years past have been in the 200 range. About the same as my fill water.
I had the same result when testing my fill water.
Only thing different this year as opposed to last year is this year I purchased a refill kit for my TFT test kit. All new regents.
Is it possible I have a bad batch of test chemicals for testing the calcium level. All other tests seem to be in line.
I realize I need to make some adjustments to the numbers below.