So far so good. Iv been fighting with Neptune systems to send me out a new lab grade ph probe. Mine keeps reading in the low 7 range. But when I use an API test kit or brigg water into the store my ph is always 8.2-8.4. Those Rastas I got from you are really coming out too. I've got about a total of 5 now. Just trying to keep it maintained and stable right now.