Marineland Penguin Bio-Wheel Power Filter, Aquarium Filter Cartridges, Rite-Size C, 3 Count

as expected

I use these in my 55 gallon tank. Never had any issues with these filters and use them consistently.

I have used this filter for years and it is the best on the market.

Perfect filter for my fish tank.

filters are as described and fit like they are supposed to

I refuse to buy any other filter cartridges for my aquarium! These are high quality and extremely good at keeping the water in my tanks crystal clear!

Thought it was a high power filter. I only have a 25 gallon and I can tell you after 2 1/2 weeks I was already half changing the water and end up having to put a new filter in very disappointing.

Wish they came in pack of 4 because that's how many each of our filters take but other than that they work well

Unfortunately I purchased Eight cases of the C sized cartridges and every one has such small sized granules of carbon that a majority of it comes out from between the slits of the black plastic cartridge frame causing it to float on top of the water terribly. Luckily I have some baskets from my old penguin 330's (the 350's I have don't come with baskets or places to mount them) so I could purchase and add larger chunks of carbon in them to keep the water clearer as there is little carbon remaining in the cartridges that hasn't came out between the slits.I'm stuck with six cases (6 cartridges each) of these cartridges as the store would not let me return them. It looks as if I'll have to construct my own cartridges for all of my penguin systems.Sadly Marineland used to be my favorite brand of aquarium products but besides the filter cartridges I've had problems with other items as well especially their tank heaters.

Our aquarium has never looked better.