Marineland 24-Pack Penguin Rite Cartridge, Size C

I use two of these at a time so buying them in bulk works just fine for me. They keep the water clearer that way.

right product, good price.

these filters work great keeps water very clear. and easy to replace just lift the lid and toss the old filter

Great Deal! Definitely a must with my fish tanks! Works as directed and very sturdy and strong. Buy with confidence!

I work at a preschool and we have been overrun by guppies, therefore weve had to change our filter a lot. It is nice to be able to order online and get muitiple packs which last us most of the year. The price here was great!

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These are great cartridges, but it is the second time only 12 cartridges were shipped instead of 24 cartridges.

Thinly made. Didnt look like one bought at PetsMart.

Super price

Nice convenient way to keep your fishtank clean and healthy. Also not expensive through Amazon. The pet stores mark these way up.