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[APD] KH Test variance

Is 3dKH variance in results the norm for different test manufacturers? 
The Hagen test reads 5dKH and Aquarium Pharmaceuticals 8dKH. The 
resulting read on C02 is 23ppm vs 43ppm. Quit the difference. Should I 
bother to email A.P. and demand replacment testing agent?

Secondly, I got another test kit and it appears to be bum as well. It's 
a seachem Iron test kit. It doesn't detect jack for iron, not even it's 
own refrence sample. Them I've contacted.

- Chris.

P.S. Bill, if you see this (you should be preparing rather than reading 
this). Best of luck. I know first hand that water in the house sucks.

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