Sorry if it's mentioned elsewhere - search doesn't seem to be working for me today.
Does adding muriatic acid effect the reading of the cyanuric acid test?
I just drained 80-90% of our pool in order to get rid of our 120 CYA reading. On refilling I ran through the standard tests with the following results:
+Added 48 oz 6% bleach at this point.
CYA = 0
As the CYA was the reason for the drain, and we didn't drain the whole thing, I would have expected a CYA reading of 16 to 32. When I didn't get it, I wondered if I had clobbered the test by adding muriatic acid immediately prior. Comments?