Just a suggestion. Get a backup test kit. My Hanna tends to read higher than Salifert or when I do an ATI water analysis. Salifert always reads 0.3 below Hanna. The Salifert test kit is not that expensive and gives you a second look at your level when testing. I used them both each week and sort of average the two for a result. I watch the trident everyday looking for swings, but confirm it with the other two tests.Gotcha ok and I use Hanna as my checker! Everything looks fine and healthy I just don’t want to get it out of control