YEE Natural Volcanic Rock Aquarium Filter Media, 500G Fish Tank Filtering, Cultivating Nitryfying Bacteria | Removes Harmful Substances | Activated Water Health

The rough surface allows fast attach of culture bacteria and microbial membrane does not fall off easily upon rinsing or washing. - Cause ions activation in the water, increase the oxygen ions content.

• The volcanic rock has low resistance to water flow, it does not cause blockage.
• Allow culture of digestive bacteria (nitrifying bacteria)
• Adsorption harmful bacteria, and heavy metals such as chromium and arsenic.
• Stabilize the water pH value, provides water filtration and water quality control.
• The red color of volcanic rocks will induce red color of the fish gradually.