Optima is a very high quality active wood carbon with
Optima 1Litre resins cleans and purifies an aquarium in fresh water as in seawater of 100 liters for a duration of about 3 months.

PH, hardness and conductivity values ​​are not changed

Does not generate phosphates.

A known wooden coal and used for many years by professionals and amateurs, including for demanding animals such as discus,
invertebrates ...

One of the only coals also containing resins for improving water quality.