Step 1: Take out the dirty volcanic rocks and boil them in boiling water, which can be basically removed! At the same time, it also has a certain bactericidal effect on volcanic rocks.

Step 2: Wash the volcanic rocks with a small brush or toothbrush and get rid of the remaining stolen goods!

Step 3: expose the volcanic rocks to the sun and dry them!

Step 4: Rinse it with clear water and put it in a fish tank.

physical features

Appearance and shape: no sharp particles, small water flow resistance, not easy to block, uniform water and gas distribution, rough surface, fast film hanging, and not easy to fall off after repeated washing.

Porosity: Volcanic rocks are natural honeycomb and porous, which is the best growth environment for bacterial micelles.

Mechanical strength: tested by the national quality inspection department, it is 5.08Mpa. Practice has proved that it can bear different strength of hydraulic shear, and its service life is much longer than other filter materials.

Density: moderate density, easy to suspend, no loss during backwashing, energy saving and consumption reduction.

Biochemical stability: volcanic biological filter material is corrosion-resistant and inert, and does not participate in the biochemical reaction of biofilm in the environment.

Surface electricity and hydrophilicity: the surface of volcanic biological filter material is positively charged, which is beneficial to the fixed growth of microorganisms, with strong hydrophilicity, large amount of attached biofilm and fast speed.

Influence on the activity of biofilm: as the carrier of biofilm, volcanic biological filter material has no harm or inhibition on immobilized microorganisms, and practice has proved that it does not affect the activity of microorganisms.