Red Sea alkalinity test kit problems

[JackDemetriou]

I have the Red Sea test kit for my Alkalinity. I thought I had a high alkalinity of around 15 dKh, so I left it and decided to test it later, where I found that my Alkalinity was reading at 12dKh. I decided to do a few tests in a row, thoroughly rinsing my bikes between each test. I got varied results from 11 dKh up to 15dKh. I have used the same test kit for each test and the same tank water. What is causing this? Can someone help me out?

 

[Doctorgori]

After buying the Hanna checker when they 1st came out never looked further ....
why Red Sea may I ask?

 

[Randy Holmes-Farley Verified Community Expert]

I have the Red Sea test kit for my Alkalinity. I thought I had a high alkalinity of around 15 dKh, so I left it and decided to test it later, where I found that my Alkalinity was reading at 12dKh. I decided to do a few tests in a row, thoroughly rinsing my bikes between each test. I got varied results from 11 dKh up to 15dKh. I have used the same test kit for each test and the same tank water. What is causing this? Can someone help me out?

Your result is not normal. Even if the kit is grossly inaccurate (not saying it is, just hypothesizing), it will give the same answer every time if the volumes used are identical and the shade of color you use for the endpoint is the same. Nothing else can be wrong with such a simple test.

 

[Sabina]

How old is your test kit. I have pretty consistent number out of mine. Maybe this might help? Let me know what the answer is?


when does you kit expire?