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

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.

Great product

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.

I bought this as I couldn’t find acid free carbon. I soaked it over overnight in water and baking soda to neutralize the acid. I then dried it in a dehydrator for a few hours. It worked good for lowering the VOCs for my 3D printer.

2nd purchase. Many budget carbons are phosphate activated and will pollute the reef tank. For the steam activated carbon this is the most budget one

Love this because I don’t have to waste as much Carbon as the pet store brands. Cheaper & really really really easy. Purchase a few mush bags for the carbon -and you are setYou use way less carbon then the already picked brand named items at a pet store. Cheaper in the long run and only been using it 3 days and what a difference

I have several aquariums and need this product on an ongoing process of caring for my tanks.

ver good product. Value for money. My fish tank water is crystall clear , all my 4 gold are really happy , i can see the diffference this excelkebt product has made.Hood seller/ good packsging/ hogh quaity.5,star plus. 100% happy with Amazon who arranged this with seller wow above & beyond .Good packaging/ was delivered inproduct was delived in excellent packaging 100% as advertized. Really good / totally recommended / value for money. Great😁😁😁😁😁👏👏👏👏👏👍👍👍👍👍😃😃😃😃😃😄😄😄😄😀

Quick delivery came as described

Work Very good