Originally Posted by Sgc1107
Here's my main question What's the difference between a alkalinity test and a carbonate hardness test? Besides the price lol!
Any help on this topic would be greatly appreciated, or maybe a link to a great thread of others talking about this! I'm a bit confused!
Here's a basic Chemistry lesson. Total Alkalinity is the determined by the water Total ability to bond Hydrogen ions. Without going into a whole lot of detail, various elements determine the total alkalinity, including Carbonates and bi-carbonates, borons etc etc etc. Carbonates make up about 95% of total alkalinity and therefore the terms are often interchanged. Basically, Carbonate Hardness is (within95%) total alkalinity.
Funny thing is most tests say "Total Alkalinity" on the test, yet they also have KH
as the measurement, which is actually for Carbonate Hardness or Carbonate Alkalinity. So, I think the tests would be the same.
I have both API Reef kit and Red Sea Total alkalinity tests. During a side-by-side comparison, both test required 8 drops to change colour, but used different titrations as indicated by different colours. The API measurement is 1 drop = 1dKH while the Red Sea test is 1 drop = 1.4dKH (or 1 drop = .5meq/l). So although both test required the same drops, API=8dKH and Red Sea=11.2dKH. Hmmm. I tend to believe the Red Sea based on my dosing so I don't trust the API. My LFS
sucks and I have no faith in their ability to test anymore.