I have to admit that I don't always have carbon running in my tanks,but when I do,these Aquaclear Charcoal bags come in hand. I love the rinse and add part,it can't get any simpler.

Pros: pre packaged reasonably priced convenient

Cons: none

These beat the complete filter envelopes. No need to change out the entire filter system. Nice package and easy to use. No mess.

Pros: Simple, no mess, easy to use

Cons: none

I've had great luck with this product. It's easy to use and fits in the filter case perfectly.

Pros: Prepackaged, fits filter fine

Cons: None