View Full Version : Alkalinity calibration solution

01/07/2016, 07:45 AM
Salifert test kit and Hanna meter not coming up with same alkalinity reading.

Salifert 8.9 and Hanna Meter 7.5 dkh. Reagent and kit not expired.

What can I keep on hand to use as a calibration or check solution. I know the salifert kit has a small amount included, but I want to check more frequently than that would be practical.

Anyone have a diy solution recommendation?

01/07/2016, 01:31 PM
Hanna have got problems with alk reagents atm

I'd trust the salifert - my Hanna was 1.1dKH lower than 2 saliferts + their check solution.
Hanna have fessed up about it,you can get a replacement bottle - see post #36 in that thread

01/07/2016, 03:43 PM
There's a recipe for a DIY alkalinity solution here:


Unfortunately, it requires some precision measuring equipment.

01/08/2016, 11:47 PM
Just take it to the pharmacy, theyll do it for you. And its in my signature the recipie.

01/09/2016, 12:28 PM
Thanks, just read about Hanna Reagent problems. I ordered a new Salifert kit and will use the calibration solution.

01/09/2016, 02:49 PM
New salifert test kit came but with no check solution? Both salifert kits agree DKH 7.7.

Hanna Meter with New reagent dated 3/2017 checks 7.5 dkh

Hanna Meter with old reagent dated 11/2016 test 5.9!!!

Definitely bad reagent.