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

It sit and works perfectly

Muy buena calidad y pronta entrega

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.

Awesome Find

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.

have used them before and will continue to use them in the future

These fit perfectly and the price is great

Exactly what I expected. Cheaper than our local pet store

Filter (2) in box torn, charcoal leak in tank.

I had another pump that didn’t work as well as I needed it to. I purchased the Marineland pump and these are the perfect replacement filters. The original brand and a better price than the pet stores. Thanks Amazon for a great deal. I will purchase again.