Diamond Blend Premium Activated Carbon and Ammonia-Neutralizing Crystals is ideal for new aquariums. This special formulation of new faster-acting Black Diamond and super-effective White Diamond cleans and conditions aquarium water, ridding it of dissolved organic waste and odors as it removes toxic ammonia and chloramines. Outperforms other blends by as much as 4 to 1. Can be used in any application including power filters and canister filters. For freshwater aquariums only.
The larger size Carbon/ Ammonia blend is excellent for maintaining a nice tank. If you've never used anything but plain charcoal this is a step up as the white crystals soak up ammonia (Fish Pee) and lowers nitrates as a side effect. Less irritation on sensitive fish. I suggest using resealable velcro mesh bags for replacing sausage shaped charcoal cartridges.