Change carbon in a QT?

[No Worries1979]

How often should I change my carbon in my 10 gal QT? I have been putting the carbon in the sump of my display tank when the QT is not in use, should I replace it occasionally?

 

[Lpabsolute]

Every month

 

[supertech3]

I agree, I change mine about once a month in my 12g