JBL Clearol removes microscopic clouding which normal aquarium filters tail to take out, such as suspended particles water bloom, bacterial contamination etc. Add the required quantity of JBL Clearol to the aquarium water at a spot with adequate water movement. The clouding material coagulates into larger globules and sinks to the bottom. It is also large enough now to be retained by the filter. Suction deposits of the aquarium floor and clean filter more frequently. Use only for pH values above 6 and for minimun carbonate hardness of 5d.Dosage: 1 outer capful for 15 l, 1 inner capful for 30 l water. 100 ml are sufficient for 400 l of aquarium water.