HOB media

[jpappy789]

I've never seen any proof that carbon removes a significant amount of ferts, liquid or otherwise.

The only thing carbon really hurts is your wallet...

 

[Rbishop]

I would use it no matter what you do...wallet is a factor..but there is nothing better out there for clarity.

 

[Star_Rider]

even if activated carbon removes fertilizers..it exhausts relatively quickly...and as mentioned would eventually be come media for biofilm(aka beneficial bacteria)