Optima is a very high quality activated charcoal with resins.
1 litre of Optima cleans and purifies a 100 litre freshwater or saltwater aquarium for a period of about 3 months.

The pH, hardness, and conductivity values ​​remain unchanged

Does not release phosphates.

A type of charcoal known and used for many years by professionals and amateurs alike, including for demanding animals such as discus,
invertebrates…

One of the only charcoals that also contains resins for improving water quality.