FluvalSpec/Evo/Flex Activated Carbon, Replacement Aquarium Filter Media, 3-Pack, A1377,Black

Bought this based off the manual on my 2.6gallon tank. Says I need item #A1377. But when I received, it's almost twice the size of one that is in tank now. I don't know if my manual is just incorrect, but this is the wrong size. But that’s an issue with my manual, not this product. Product was great!

Great way to add more carbon to your filters. Very easy to install and the water is crystal clear after a little while of use.

Great deal for a good charcoal filtering media. Low dust.

They fit perfectly in my 10 gal tank.

If you calculate the cost per ounce of carbon, at $1.17 per ounce these Fluval activated carbon bags seem to be one of the lowest cost name brands And the HOB filters I'm putting them in are Fluval and great. So I figure these are good But I'm not sure if they are as effective as the much more expensive Seachem activated carbon But the Seachem was a 6 ounce bag, which cleared the brownish color of the water, but at $22 costs too much to replace each month. Which reminds me, its time to change them.

Can’t go wrong, I use it to clean up any impurities in the water, plus great for knocking out ammonia levels

We decided to do a deep clean four days ago on our saltwater tank. After the clean it did not return to its previous state of crystal clear water and appeared very cloudy with white particles. We assumed that we had kicked up some funk in the sand and created a bacteria bloom. This was the first time we have encountered this, so we did our research and decided we needed to over oxygenate the water, and then add fine filtration to the system.When this first started we did a water change, and added a fresh zorb pack to help clear the tank. That with increased aeration seemed to help but was not making quick enough progress to settle our nerves. After four days of waiting for the cloudy water to clear, we decided to add these active carbon filters to the mix! After a good rinse we added these to the filter and OVER NIGHT they seemed to have completely cleared up the tank!It was a relief to wake up to clear water and happy fish! Overall the cure to the bacteria bloom seemed to be these active carbon filters, and water aeration (we added a new bubbler)! These are an affordable option that did the trick and arrived as expected! They are small, but I just used two in my filter to create full coverage. We will keep these on hand and incorporate these into our tank maintenance moving forward for crystal clear water!

Fluval is the maker of my marine tank and these are the activated carbon filters that I need to change every two months or so. Excellent price for the pack of the and cleared the cloudy water within an hour.