Carbon and chloramines?

[tmccaff]

I tested my waste water and getting 0.03 from the Hanna 711 is it time to replace the carbon filters?

 

[Randy Holmes-Farley Verified Community Expert]

Was it ever lower? Do you know it is chloramine?

You are at the limit of accuracy of that device:

https://www.hannainst.com/hi711-total-chlorine.html

Accuracy @ 25°C/77°F

±0.03 ppm