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

Very good quality, cleared the water within an hour of adding this to my filter pump.

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!

These carbon pouches fit in many aquarium filters, tho perhaps not the perfect factory filter pouch, they are just pouches of carbon and fish can't read. If the price is low, these are a great deal from a reputable brand.

Exact same as photo, used a few times now and keep my 15G salt water reef tank super clean !

I was expecting the size of the carbon packs to be slightly larger considering it was listed as a replacement filter media for the Fluval Flex and I thought the packets would contain “pellet” sized activated carbon but it was more like coarsely ground coffee. I would highly recommend soaking the packets in water two or three times for about 10 minutes each (with a bit of agitation) and rise in between soakings rather than just a rinse and use. For the last soak, I used my fish tank water. For the money, it seems to do the job of clearing up the water and there was no change in my fish’s behavior or noticeable health after 2 weeks.

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.

No drama…it is what it is. It’s a genuine Fluval carbon filter pack that fits the tanks it says it does.

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.