Treat your tap water, and provide a safe environment for freshwater fish instantly and easily with API AQUA ESSENTIAL water conditioner. Tap water contains chlorine, chloramines and ammonia which can cause gill and tissue damage, breathing difficulty, stress and death. API AQUA ESSENTIAL water conditioner works instantly as a water conditioner to remove chlorine and chloramines from tap water and neutralize heavy metals. API AQUA ESSENTIAL water conditioneris good for both freshwater and saltwater aquariums. API AQUA ESSENTIAL water conditioner also removes toxic ammonia, nitrites, and nitrates to restore a healthy aquatic environment when your test results show high levels of ammonia, which is extremely toxic for fish. With API Aquarium products, its easy to keep a beautiful saltwater, freshwater or reef aquarium. For close to 60 years, API has been creating innovative, research-driven solutions that make it easier to care for your fish and aquarium. API Aquarium Treatment Supplies are designed to work in conjunction with each other to provide best results to control algae, promote healthy bacterial growth and help control and cure fish diseases and conditions such as ich and fin rot. They work to provide a safe, hospitable environment for fish such as tropical community fish, cichlids, goldfish and more. With API, you can spend more time admiring your fish, and less time scrubbing your tank. Make sure to use all products as directed in order to ensure the best results.