[newclean]

My API calcium kit tests right in line with my Salifert kit. Also, my API alkalinity test kit always matches my Seachem kit. API makes the best kits I ever used. Maybe they expire before people can use them, or maybe people don't shake the right bottles. I never had a test kit expire but it must be frustrating because they are not properly marked for expiration. Just use them fast, inside of a year should be good for kits without a printed expiration date.