Shake well before using. Dilute one drop per gallon or 5 ml (1 tsp) per 50 gallons of aquarium water in a separate clean container and evenly disperse around the aquarium. Particles should begin to precipitate out of water within 6 to 8 hours. A properly working mechanical filter using a fine filtering medium will collect particles and can be easily discarded. Allow 8 hours before siphoning. Repeat in 24 hours if necessary. If the tank is extremely cloudy, double the dose but do not use more than two doses per week. Do not use in freshwater. KENT Marine Pro-Clear is not an algaecide and will have no effect on hair or slime algae. To prevent cloudy water avoid overcrowding, do not overfeed fish, perform regular water changes and maintain sufficient filtration and water circulation. Use KENT Marine Poly Ox if tank is cloudy from being overloaded by dissolved organic matter in the system. Then, wait 24 hours before using this product.