Is it ok to use carbon all the time?

[Erink]

Can I just leave a mesh bag in my sump?

 

[bobnicaragua]

I always have. I change it out once a month.

 

[James M]

Yes but you’ll want to change it out every month

 

[vsolovyev]

Yes, you want to change every once in a while because the gunk will start raising your nitrates and phosphates.

 

[Clownfishy]

I use very small amounts and change weekly as I believe it is exhausted very quickly