I’ve been getting crazy readings from my Hanna alk checker just done a water change a few hours ago decided to do a alk test with the checker got a clean vial placed it on my jewellers scale tared to zero then added 10ml of tank water and followed the usual procedure got a reading of 10.3 which is crazy as I use Red Sea blue bucket the reagent expires august this year is this just bad reagent or is my Hanna checker screwed I read a post from way back saying you should minus 18% from the checker reading which would make my alk 8.4 which would be around right. Any advice apart from get new reagent ?