Provide best volcanic filter f

Products Name:volcanic
Quantity:10000MT
Packaging:25kg per p
Full Size:grey color
Place of Origin:Beijing
porinessthe inside and outside average poriness is about 40%, the resistance to water is very small, comparing with the same kind filter, it costs less, but can reach the expected filtering purpose. 2The specific surface area: the specific surface area is large, the opening holes are many and inertia, so it is suitable for microorganism to touch and form film, keeping large quantity of microorganisms, so it is favorable for the transference of the oxide and nutrition, and waste during the metabolism. The filter shape and water flow regim: Since volcanic biological filter is granulous without sharps, sand the hole diameter is larger than ceramsite, so it has small resistance to water when it is used, and it can save energy cost.