Which test to trust?

[Hrosik123]

Hi all,
Wondering who to trust. Salifert has DKH at 7.7. My Hannah has it at 5.5. Mag and calc are very similar so I’d like to do soda ash to raise DKH but who’s reading is more accurate? I guess I could average at 6.6 but was hoping for some insights.

 

[CoralB]

Hi all,
Wondering who to trust. Salifert has DKH at 7.7. My Hannah has it at 5.5. Mag and calc are very similar so I’d like to do soda ash to raise DKH but who’s reading is more accurate? I guess I could average at 6.6 but was hoping for some insights.

I’d say the Hanna is probably more accurate . IMO

 

[rtparty]

Just an educated guess here but Salifert. Hanna reagents are more widely known to have issues compared to Salifert

However, make up some new water and test the alkalinity with both. That should give a clue to which is more accurate (or at least more reliable)

 

[Evil1]

I trust salifert. Using for many years. Every now and again I check it against Red Sea test kit and always spot on.

 

[eggie]

I say Salifert. Iv seen Hannas Alkalinity test givin bad readings

 

[NanoSteam]

I only have the Hanna Po4 kit so can't comment on their Kh test kit but my Salifert has been reliable. I just got a new box in today and it measured dead on with my old box. So very consistent.

 

[CoralB]

I say Salifert. Iv seen Hannas Alkalinity test givin bad readings

I don’t have the alkalinity test . That might be true .

 

[Randy Holmes-Farley Verified Community Expert]

One can make a DIY standard to test:

https://www.reef2reef.com/threads/diy-alkalinity-standard.714738/