Aqua Medic Mini-Deniballs Are filter material and bacteria feed for the Nitratereductor
Mini-Deniballs are manufactured from an unique biologically based plastic.
One package of 0.5 litres (c. 0.2 gal) is enough to supply a Nitratereductor as the sole food source for 12 months. Changing the Mini-Deniballs after approximately 12 months is recommended to ensure safe and maintenance free denitrification in fresh- and saltwater aquaria.