Mailport: May 2012
Diy Vent Filter
As a committed DIY person, I am rather interested in your homemade holding tank vent filter (PS, March 2012) and know it would be easy to construct. What did you use for the carbon filter? Where might I get it?
Harvey McChesney III
Although there are specialty carbon products optimized for sulfide treatment, they are not available in less than 50-pound bags, so we chose something more practical: pelletized carbon (like Marineland’s Black Diamond premium activated carbon) from a pet store (www.petco.com) or aquarium supply store. Pelletized carbon is preferred for gas treatment, is widely available, and is relatively inexpensive at about $10 per 10 ounces (a single fill requires about 8 ounces). The internal carbon supports we used were cut from open-cell foam used for aquarium filtration ($2 for 30-gallon size), which you also can find at Petco and other pet stores.