Tri-Base Pelletized Activated Carbon for Aquariums Removes Chloramines, Chloride, Fish Orders, Yellow Water, Growth inhibiting enzymes and other chemicals Tri Base is shipped fluffy and dry, with no water added for weight. Hard pellets do notr turn to mush and flow down the drain into the aquarium, or clog the filter with fines. Great for canister filters and any aquarium filter mesia tray Superior to other types of activated carbon.