Planted Tank Guru
Join Date: Jul 2010
Location: British Columbia, Canada
Pretty much agree with all the comments above.
Using carbon seems to be a reasonable clarifyer for a short period of time, and does remove unwanted meds after a treatment, but other than that, it seems quite suspect for doing any good after a while, perhaps even leaching unwanted elements back into the tank in time. I've avoided it for many years.
After much lengthy trial over the years, I much prefer Purigen, which does a great job on a long term basis at removing impurities, clarifying, polishing, and purifying.