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Amazon.com : K2 Bio Filter Media Moving Bed Biofilm Reactor (MBBR) for Aquaponics, Aquaculture, Hydroponics - Ponds - Aquariums by Wholesale Koi Farm, (2 Gallons) : Pet Supplies
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Amazon.com: K2 Bio Filter Media Moving Bed Biofilm Reactor (MBBR) for Aquaponics, Aquaculture, Hydroponics - Ponds - Aquariums by Wholesale Koi Farm, (2 Cubic Feet) : Pet Supplies
![LAVA ROCKS as MECHANICAL filter ? people use lava rock as bio media in small-sized pebbles but i want to use it as mechanical filter in in my diy filter for my LAVA ROCKS as MECHANICAL filter ? people use lava rock as bio media in small-sized pebbles but i want to use it as mechanical filter in in my diy filter for my](https://preview.redd.it/nnncrte4h8671.jpg?auto=webp&s=819cd3694ce5ffce27cfe8e3b55f0234ebcf9cfc)