Penguin Bio-Wheel Replacement Filter Cartridges, Rite-Size C, 6 Count

The Marineland Rite-Size Cartridge C is a must-have for anyone with an aquarium that uses a filter system compatible with this cartridge size. I’ve had a hard time finding these in stores, and when I do, they are often priced way higher than I’d like to pay. That's why I love getting them on Amazon – they’re so much more affordable and I don’t have to deal with store shortages. These cartridges are easy to install, and they do a great job of keeping my tank clean and clear. They’re designed to remove impurities, odors, and debris from the water, which keeps my fish healthy and my tank looking great. The quality is consistent, and I can rely on them to do their job without fail. For the price and the convenience of getting them delivered, I highly recommend these cartridges for anyone with a Marineland filter. It’s a great deal compared to buying them in person at the store, and you’ll save both time and money!

Works well. Fits good into hang on back filter.

The secret to a clean fish tank is to change the filter every 3 weeks! These are affordable and work well!

The product is top tier quality.

Works well and are easy to install but like with other filters they are excessive in price which is why I am doing 4 stars instead of 5.

Excellent filter at a premium price! To get the water crystal clear requires two filters, replaced every two weeks. Unfortunately the copycat replacement filters are junk, so if you are going to use this aquarium filter (which is sold at a very reasonable initial price) be prepared to eventually pay up for these expensive replacement cartridges.

Was so happy to see these worked on my filter. They were way cheaper here instead of the store price n they are made real good n don't fall apart like some filters do.

The Penguin Bio-wheel pumps are great: quiet, effective and long-lasting. (I have a 170 filter in a 39 gallon tank.) These size C filters are widely available, but the Amazon price is much lower than at my not-so-nearby pet store. But a word of warning. The day after changing my filter three months ago I began losing fish. Next morning my 6" long Plecostomus was dead. Then three Clown Loaches, each about 5 " long. Within a week I had lost 18 of my 20 fish. Yet there was no sign of disease. A water test and much internet searching finally pointed out what I had done wrong. I had neglected my tank for a few weeks, so in a rush to catch up, I siphoned out about 30 percent of the water (more than usual), doing a "better" job of siphoning up detritus from the gravel than I usually do. Then - and this was the biggest mistake - I replaced the Penguin filter too! The result is the water chemistry changed too quickly. The Nitrates spiked to a deadly level. My tank, that had been healthy for more than two years, needed to be started over after many water changes and waiting more than two months to add new fish. I visited perhaps a dozen "fish forums" and only one had a comment saying "don't change filters when you do a water change.' The Penguin filters and the box they come in carry no warnings. What I (and you) should do is simple: space your water changes and filter changes a week or two apart. Now knowing how important the "aged" filter is (especially in a tank like mine with no under gravel filter) I've started this habit: there's just enough space to get a second filter flat against the old filter. After a couple of weeks, I remove the older filter and put the newer one - by now doing some biological filtering - in its place. That way there is never a time when the tank is depending on only a new filter. For larger tanks (say 55 gal and up), the 330 or 350 Penguin pump holds two filters side by side, so the advice here is to change only one filter at a time. Hope this helps you avoid the disaster that hit my tank. Marineland Penguin 350 BIO-Wheel Power Filter Marineland Penguin 200 BIO-Wheel Power Filter Marineland Penguin Rite-Size Ready-To-Use Filter Cartridges Marineland Penguin Cartridge B 125/150B 6 Pk

Great product, filters tank well.

Sirve para para mi filtro Marineland

It fit perfectly, and was $3 less than buying from PetSmart. Just he careful when you open the package as some of the charcoal dust could spill.

Great value for the money. No complaints here.

fits well, works well