Pumix is light and porous, has many channels and holes, thanks to which beneficial nitrifying bacteria settle on it, which transform toxic ammonia (NH3), and nitrite (NO2) into the least harmful form of nitrogen, i.e. nitrate (NO3).
The pumix is a biological filter cartridge for external / bucket filters.
Pumix should be rinsed under running water and then placed in filter baskets. When cleaning the filter, rinse the insert in aquarium water, and replace it every 6 to 12 months.