Acurel ammonia away green is laboratory proven to be 2 times more effective than competing products at removing ammonia (the number one killer of tropical fish). This super-effective green zeolite is superior to standard zeolite, making it the best way to rid aquariums and ponds of ammonia. Ammonia away green creates a healthy environment for fish, minimizing foul odors and cloudy water conditions. Suitable for fresh and salt water.