Salifert Test Kit Problem

[Troy Valentine]

I've been using Salifert test kits for years without a problem. However recently I through my chemistry way out of wack because of two faulty kits, Alk and Mag. In all fairness the Mag kit was a few months past its expiration, so that was on me. The Alk kit had over a year left before it expired. The problem was I trusted these kits and dosed accordingly. Lucky I noticed a problem before I did any damage to the system. Thank you Mark (rockmp)

Old Kits:

Alk 4dkh
Mag 870

New Kits:

Alk 15dkh
Mag 1650

I lost a lot of faith in test kits. I found the Mag result very troubling, If the kit was only a few month past the expiration, when did the reagent start to degrade?

Has anyone else experienced this? And which brands are you currently using?