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Review on 🐠 Penn-Plax Filt-a-Carb Replacement Activated Carbon Cartridges (2 Pack) - Enhancing Chemical Filtration in Freshwater and Saltwater Aquariums by Eric Webbie

Revainrating 2 out of 5

Requires modification for newer underground systems

Doesn't fit my new gravel system. The original system is a tube that runs all the way through the filter head and ends with an air stone at the bottom of the tube. These filter heads are too narrow and you need to modify the hose with a soft air hose, making the heads unadjustable. Instead, you should buy cartridges that fit into the front of the filter head.

Pros
  • Nice packaging
Cons
  • Some cons