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

Works well

Quick transaction and perfect for what I needed ! Thanks

Great value and functions well!

Just like the other reviewer stated, the carbon was all over the place. It was all loose inside the box and spilling/leaking out of the box. Price was great, but perhaps this was a defective one.

Fish died a few day after install

Work great!

Is working so far

I have a 39 gallon tank for my Mr. Franklin. He is a dick and kills off his friends. I used to use honemade filter bags yet ran out.

About the only kind available. Soooo

Excellent for Aquariums