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

Bombed my tank for worms. The value on this jar was great. 3 lbs. The worm treatment wanted me to use 1 lb per 50 gallons. Soni sued 2 lbs and have another lb or so for emergency. Make sure to give it a good rinse. As you would for any activated carbon.

Great value--lasted a couple of years for our 20-gallon tank. Did the job! With a name like Kolar--it's gotta be excellent! (My former surname). :}

Good quality and delivery on time

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.

Very high grade carbon. Needs very little rinsing. I was really impressed. I had a problem with hair algae, and this product pulled out a lot of dissolved organics from my reef tank in just a few days.

Best deal for the money

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

I put this in a fill bucket for my garden to remove chlorine from the water. I don’t have a chlorine test but I did see all the slimy algae disappear leaving crystal clear water. Meaning it at least absorbed all the fertilizer from the water (and I’m assuming the chlorine too). For that reason you shouldn’t add it directly to planters though. I added it loose but soon realized and aquarium strainer bag would have been better to make it easier to change next year. Next time I will. For my purposes it was easier than a standard carbon filter and a tube because that kept clogging from buckets that were even slightly dirty. If my hose hookup was closer then I might have attached a regular filter to that or perhaps a sediment filter and then a carbon filter.

Not tio much dust. Size is great and it works great. Would order again.

Aluminum free activated charcoal is the best. Most other companies are not as pure. Very satisfied. Also, Lisa in customer service is a star that represents this company.

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😁😁😁😁😁👏👏👏👏👏👍👍👍👍👍😃😃😃😃😃😄😄😄😄😀

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 set You 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