Last night as I was getting ready to test for FC and CC (I have the TF-100), I placed a heaping scoop of R-0870 using the tiny blue spoon to my 10ml pool water, the water didn't turn pink. It stayed clear. I thought there is something wrong because I tested a few hours before and it was above shock level and I have only been losing like 2 - 5 ppm at the most. I decided to toss that water and started again and this time the water turned pink. I used the same water from my measuring cup.
What happened there?