I have a Salifert Alk test kit that does not expire until 2020, however I suspected the reading was off since my Alk level tested pretty low. I ran the check solution that came with the kit and it was off -1.6dkh.
Question... Is it safe to continue using the kit to test and just add 1.6dkh to whatever my readings show?
Question... Is it safe to continue using the kit to test and just add 1.6dkh to whatever my readings show?