KH Director vs Hanna Alk

[BurgerFish]

Hello,

I always trusted to my Hanna Alk Checker. My alk was high and don't fall even with insane coralline grow. SPS doing bad.

I bought the KH Director and the results was low 4.5-4.7. I recalibrate everything using the lab grade cylinders, submerged their filter. Still low - 5.7.

Hanna reported 7.5-7.7.

I tested the GHL Calibration 7.5 fuid and the results was 7.7...

I tested my water with Salifert KH and it's... 5.7.

So, KH Director is accurate. Hanna checker is a piece of ****, I lost so many time, sps and money tried to fix everything. But it just their Alk checker wasn't accurate.

How fast can I rise my alk daily?

 

[CasperOe]

You‘ll get a million opinions on this here, so sit back; make some popcorn and enjoy!

I’d say 0.5 dkh/day but that is purely an opinion based on anecdotal experience..

Out of curiosity, did you consider having an ICP test made to confirm your findings?

 

[radfly]

He likely does not have 10 days for ICP turn around.

The Hanna Alk is a terrible waste of money and is not to be trusted. The deviation due to reagent instability will definitely cause grief and SPS death.

I am now using Salifert as my Hanna started reporting Alk 7.5 and using a new bottle of reagent it read 9.8. Salifert was correct at 8.5

Sorry for your loss, blame Hanna.

Raise Alk by .5 dk per 24 hours.

 

[ZombieEngineer]

If the salifert is not expired, I would have a tendency to to believe that particularly since it also matches the KH director. Usually if two measurements agree and a third doesn't the two that agree are correct.