Seachem Clarity is the ultimate clarifier for both fresh and saltwater. It employs an advanced polymeric flocculating agent that is both reef and plant safe. Clarity is the only clarifier on the market that does it all Water clarifier for fresh and saltwater aquariumsHelps clear cloudy water fastSafe for use in live plant and reef tanksSeachem Clarity will clear all types of clouding, including: bacterial and other biological type blooms, chemical clouding, and particulate clouding (i. e. stirred up gravel bed). When Clarity clears up bacterial clouding it helps to accelerate and enhance the colonization of the biological filter by efficiently relocating these natural biofilms to the biosupport media in the filter. Directions: Use 1 capful (5 mL) for every 20 gallons. In some situations the cloudiness may increase slightly after adding Clarity, however this is normal and is a sign that Clarity is actively working. Rapid clarification will follow.