PH testing, and Alkalinity Questions

[mark]

Originally Posted by Myka

I have a Salifert kit for alkalinity and even though it matches the calibration solution they send with the kit the kit reads 2 dKH higher than accurate, my last one was 3 dKH higher than accurate. I won't buy another Salifert kit for alkalinity.

2-3 higher than what if matches cal solution?

[Myka]

You see, I think the calibration solution that comes with the Salifert alkalinity kit isn't accurate. My two Salifert alk kits were tested against Elos and LaMotte. The Elos was accurate to the LaMotte.

[fishytime]

I went through the same issue with the salifert dkh test kit http://www.canreef.com/vbulletin/sho...hate+test+kits....

[Myka]

Ok, I've found this interesting...

Many people believe it is "general knowledge" that Salifert is 2 dKH higher than Elos. Most people believe Elos over Salifert.

In the mid 2000's in the USA it was popular to keep alkalinity at 9 dKH. The most popular alkalinity test kit? Salifert.

In the last few years it has become more and more popular to keep alkalinity 7 dKH. Interestingly enough Salifert is losing sales as Elos creeps into the market.

NSW alkalinity values are usually around 7.0 dKH (Randy Holmes-Farley).

Is this all coincidence or just works from my particular perspective? Opinions are always relative. I'm not the first to notice this interesting trend though.