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API Ammonia Fresh Water & Saltwater Aquarium Test Strips quickly and easily checks your aquarium's ammonia levels. Fish continually release ammonia into the aquarium through their gills, urine and solid waste. Uneaten food and decaying organic matter also add ammonia to the water. Ammonia is toxic to fish and can cause gill damage, stress and death. Regular testing is recommended because ammonia levels can build quickly due to fish waste and uneaten food. Safe for use in fresh and salt water. Features: Monitors water quality and prevents invisible water problems that can be harmful to fish Dip test strips into aquarium water and check colours for fast and accurate results Use: Simply dip the test strip into the water, then compare the results with the precise, easy-to-read colour-coded chart to determine if any action should be taken. The chart includes recommendations on how to treat the water and neutralize ammonia.