Acurel Extreme Carbon Ammonia Away Blend combines Extreme Activated Carbon Pellets with Ammonia Away Green containing green zeolite. Independently they have proven much better results than other filter carbons and competing products. Together, they create a unique system that effectively removes ammonia and other toxic substances while eliminating discoloration and bad odor from aquarium water. This provides a safer environment for your fish and plants to thrive in while maintaining super clear, higher-quality water. With frequent use, this blend will even promote increased filtration efficiency. On top of providing superior performance, these jars feature a twist-on/off design with a flip-up handle for simple handling.