Alkalinity calibrating?

[tmccaff]

I am trying to figure out if my Kh Carer is accurate vs my Hanna checker. According to red sea my batch is 8.148 DKH at 35.5 ppt of salinity. Could I make a cup of mix water at 35.5 and test results and calibrate from that? Is there a more accurate way to determine which value is closest?

 

[dwest]

I am trying to figure out if my Kh Carer is accurate vs my Hanna checker. According to red sea my batch is 8.148 DKH at 35.5 ppt of salinity. Could I make a cup of mix water at 35.5 and test results and calibrate from that? Is there a more accurate way to determine which value is closest?

I personally wouldn’t trust the salt manufacturer data.

I check my alkatronic vs Hanna monthly. If I mix my alkatronic reagent correctly, they are within a few tenths dKH. That’s close enough for me.

What do you get when compare your KH carer vs Hanna?

 

[Randy Holmes-Farley Verified Community Expert]

I would not trust that either, and if they are the source of that number with 4 significant figures, I’d trust it even less as it smacks of being misleading.

 

[tmccaff]

Well my Hanna was showing 8.38 and Kh Carer was showing 7.06. I just got my ATI results back and seems my Kh Carer is correct.

ATI shows 7.09

 

[Randy Holmes-Farley Verified Community Expert]

Are the reagents for the Hanna new? Some folks find them to go bad.

 

[gbroadbridge]

Well my Hanna was showing 8.38 and Kh Carer was showing 7.06. I just got my ATI results back and seems my Kh Carer is correct.

ATI shows 7.09

A Salifert test is useful for being the arbiter in situations like this.

If you don't have that, try a new bottle of Hanna reagent.

 

[David_CO]

Hanna alk egg only works well with recently opened reagents. There have been discussions on refrigerating the reagent to prolong the accurate life span. I don’t use my Hanna alk egg anymore and use a cheap salifert test to compare to my auto testers. For me salifert reads about .2 dkh lower than my Alkatronic and kh keeper.