Quote Originally Posted by Gracy101
I was concerned too. But in researching what could possibly be causing that result (ie tester error ) I came across a post from 6/12 on another part of the forum which was relevant. It seems the particular kit I'm using from Walmart, seems to have a problem with the hardness test. Waterbear posted an alternative way to conduct the test using the kit, sorry I'm not too well versed to explain the why of it. When I conducted that part of it following those instructions it came up 50.

I printed out those instructions so that I could conduct it again this morning to compare. I'm sure that it is a more realistic result, consistent with previous numbers.
yes, but CYA is not a hardness test...i'm not concerned with your cal hardness numbers...i am concerned (test kit error) with your cya stabalizer level numbers...it really can't be 50 and 0 in the same day...or did I missread something?