Evolution Aqua PURE Aquarium – 50 Ball Tub Crystal clear, healthy water made easy. PURE Aquarium is a natural bacterial treatment for freshwater aquariums of all sizes. Every ball contains millions of live bacteria and enzymes that break down ammonia, nitrite and organic waste, the most common cause of cloudy water, leaving your tank clear, healthy and safe for your fish. Use it as part of your regular maintenance routine, or when setting up a new tank to help mature your filter. Millions of live beneficial bacteria and enzymes in every ball Breaks down ammonia and nitrite Breaks down organic waste for improved water clarity Reduces filter and tank maintenance Helps mature new filters and speeds up tank start-up Easy dosing with biodegradable gel balls You cannot overdose Award-winning product from Evolution Aqua How to use: Add the balls directly into your aquarium or inside the filter Regular use: add 1 or 2 balls per 25 litres of water once a week First use, or if your water has clarity problems: add 5 to 10 balls per 100 litres, then return to the regular dose once the water clears New tanks: use when starting up to help mature your filter Good to know: Safe for fish and invertebrates We recommend adding oxygen to your tank using an air pump or venturi PURE Aquarium is not designed to clear green water. A UV clarifier is recommended for this As a natural product, the balls may vary in size Wash hands after use and keep out of the reach of children