6-Pack, Size B, Rite-Size Cartridge Refills

Works great

Excellent for Aquariums

Just like the original one. Does what its required

Exactly what I needed for our fish filter.

This is the easiest to use, most complete, and easiest to use kit on Earth. It has guided me thru my new Aquarium and I am so satisfied! This fron a 50 year okd aquarium aficionado. Thank you!

The product was exactly was what I wanted but it came crushed and charcoal from the filter media went all over the floor. The packaging was inappropriate for the merchandise.

Its the wrong size! It says size B but its actually size C. I have a filter that uses size C so its not a big deal but it should be what the product says.

They work fine! Best to get when on for a good price!

Good

About the only kind available. Soooo