Acurel F Water Clarifier is a concentrated formula that keeps freshwater aquariums crystal clear while fighting the negative effects of over feeding and improving filter efficiency. Its super fast abilities are natural and safe for your aquatic life and plants, created with organic extracts from renewable resources. The cloudy, green or polluted contaminants will noticeably disappear when used in conjunction with a skimmer or pump and filter system. Rest assured this method does not harm the beneficial bacteria in biological filtration set-ups. As an aquarists "best friend", Acurel F Water Clarifier is used and trusted by aquarium hobbyists and professionals. It is known for its quick Crystal Clear results. Made in the U.S.A!