Lava Rock Filter Media
-Size small: 1 - 2cm
- Size big: 3 - 5cm
500g
- Lava Rock makes an economical biological and mechanical filter media
- Can work for de-nitrifying (nitrate removal) due to deep pores and over all surface area in comparison to over all size and surface area exposed to water flow & oxygen.
- Highly porous with high surface area for more aerobic and anaerobic bacteria colonization.