- Joined
- Apr 24, 2016
- Messages
- 51
- Reaction score
- 34
i have a 2 yr old alk checker from Hanna. It had a solution that said HI755 checker. Any new ordered liquid says HI 722 or something different from mine. Is that an issue? I used it to test my water and it came out to 185ppm which is 10.36dkh (in the correct range.) any thoughts?

