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

These filter well, but I wish they were more environmentally friendly. They would be more efficient if I could clean them for reuse. They leave black specks on the fabric which sometimes get into the tank. They do a good job cleaning the tank.

Works great

They say filter should last several weeks, barely lasts several days

My fish are happy so I am Happy! Thank you

In this last shipment, the carbon had shaken out of the filters and was all over the inside of the shipping box. Usually thats not an issue. Kinda messy.

Perfect fit and great amount so I dont run out.

excellent!

These fit perfectly and the price is great

We have always used this product and was very happy to get it from Amazon

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.