Review on Boyd Enterprises ABE16705 Chemipure Aquarium by Debra Hernandez

Used in marine applications so salt water burns through this stuff like you won't believe. In general, charcoal does not have the longest shelf life when it comes to aquarium use. The bottle says up to 4 months between replacements. I usually service them every few months or so. If you're looking for quality charcoal to help reduce toxins and clean up your water a bit, this is pretty good stuff. For your hardcore needs I would use a reactor. This will work in no time.