Calcium reading

[In the sticks]

I’ve been testing with api for the last few months and have maintained 460ppm. I just got the Red Sea Calcium pro and it is reading 525. Any thoughts is the api test just that bad?

 

[In the sticks]

I’ve been testing with api for the last few months and have maintained 460ppm. I just got the Red Sea Calcium pro and it is reading 525. Any thoughts is the api test just that bad?

My alk is at 10 according to the api test. But I’m starting to Dout all api test results

 

[In the sticks]

Or I’m not doing the Red Sea correct I tried 3 times same results

 

[Randy Holmes-Farley Verified Community Expert]

Hard to know what (if either) is accurate here.

Try the kits on some new salt water at known salinity from a known brand and see how they come out.

 

[In the sticks]

Hard to know what (if either) is accurate here.

Try the kits on some new salt water at known salinity from a known brand and see how they come out

Good idea! I will try this today. Thank you