Volcanic Rock makes an economical biological and mechanical all-in-one filter media. It can work for de-nitrifying (nitrate removal) due to deep pores (anaerobic zone) and other surface area exposed to water flow & oxygen (aerobic zone) will be urdergoing nitrification converting your toxic ammonia and nitrite to nitrate.
It is highly porous and small in size (appx. 8 -10mm) making it perfect for mechanical filtration. However, you need to ensure the volcanic rock is not overburden with solids and hence flushing and rinsing the volcanic rock with system water (so as not to kill beneficial bacteria) is crucial to ensure filter working in optimal conditions.
It is ideal for Bio fall, Savio Livingfalls, DIY, barrel, pond filters, and also for wet/dry and canister aquarium filters. This Volcanic Rock can also simply be placed directly on the bottom of aquariums or fish bowls. Best results with this method are achieved in areas of more water movement. Care should also be exercised when used directly on the bottom of an aquarium where fish with delicate fins or barbells are present such as Bettas or Cory Catfish. With these fish, placing the Volcanic Rock out of the way or partially covering the rock with something more smooth is recommended if used directly in the aquarium.
It is inert and safe for all aquarium and pond applications (including marine) as well as aquaponics.
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