It is an ultra-porous mineral support where bacteria can settle and carry out their purifying action. It supports aerobic and anaerobic bacterial species thanks to the external and internal macroporous surface. This allows you to remove nitrates along with ammonia and nitrites. Since most of the bacteria are housed inside, BIOROCK can be rinsed, preferably with aquarium water, without damaging the filter. For the first use, place the contents in a loose-knit sock and rinse the product under running water to remove any dust or residues. It should be placed in the filter, after mechanical filtration.

For sea and fresh water.