Marineland Rite-Size Cartridge Refills (18-Pack, C - Blue)

Using the manufacturers recommendation, also just by looking at the water quality, its obvious these filters are doing their job. My fish love it thank you

Excellent product which met all needs

Our filters are great. Easy to remove and insert. We can buy in bulk and save (even better!)

Not much to say, theyre good filters.

Not sure if these are original or just poorer quality, but they were of weird color, super dusty from the charcoal, and the spongy part was a bit too firm from what I’d consider their usual product. Either way, it’s ok value for the money, hence 3 stars.

as always, just fine