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

It sit and works perfectly

Excelente

I get twice as many at this price compared to what I was paying in the store.

I like my filter that why I buy it its cheaper then store

Adequate.

always works well for my tank

Just like the original one. Does what its required

These are all standard products function as expected

My fish are happy so I am Happy! Thank you

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.