... (such as soil and sand and gravel soil, soil and concrete, etc.) for isolation. So that two or more materials ... a good hydraulic material, which can from a soil internal drainage channel, soil structure and excess liquid gasemissions. 4 Reinforced Acupuncture use ... Filtration : The filtration layer of the dykes, river canal, seacoast, concrete slope, retaining walls. At the same time of preventing the ...