Kolar LabsCrystal Cal Activated Carbon – 5 Gallon, Activated Charcoal for Aquariums and Fish Tanks

Good value. Not the cheapest, but it's also one of the highest quality, made with lignite and not cheap coconut fiber. Won't cause HLLE in fish. Also can be used in rodi Filter.

works well in clearing your aquarium water

After wasting so much $ at the large “P” stores on fish aquarium essentials, starting to get items in bulk. Excellent charcoal.

Buying filter carbon cartridges for both canister or aquarium filters that hang on the back can get expensive. This is a way to reduce the cost by buying the activated carbon in bulk, then purchasing mesh zip up bags to fill. (Bags are not included). On jar of this carbon will fill a lot of bags making the cost of the filter change nearly nothing. I have noticed that it takes a long time to rinse out this carbon though. Seems to be a lot of dust. It takes me about a minute or more of rinsing to get clean water through it. I have had other filter carbons rinse clean in 10 to 15 seconds. Overall though it works fine with just a little more work up front.

This is great value filtering media .it works perfect at removing foul smell from aquarium and water is crystal clear. Clean water - healthy fish

This was exactly what we ordered. We appreciated Amazon. Thank you so much for the quick delivery. We were actually looking for something a little bit bigger, but it fit the bill and it worked.

Better to get this than buy replacement carbon cartridges. I cut part of the top off my old carbon filter bags and empty them and refill them with this carbon. I have about 6 carbon bags and I wash and rotate then refilling with this. Tank stays clear way longer that standard carbon filter. I used to get 3-4 weeks before the water goes cloudy now with this I have gone 8-10 weeks before I feel guilty enough to change it. I haven't see the water go cloudy yet. My tank has 2 gourami, 3 rainbow sharks, 4 Danios, and 3 Molly.

Works well