Fish Mate Supra+ Biological Filter MediaFish Mate Supra + Biological Filter Media has a large surface area for beneficial bacteria breeding. It reduces ammonia and nitries in your pond or aquarium. Improroves water quality Suitable for all pond and aquarium filter systems Large surface area INSTRUCTIONS: Rinse filter medium in water before use. Place in the filter. Replace 50% of used media every 12 months. For ponds completely fill the biological media section of your filter with filter