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drainage board
Polyethylene film
geomembrane
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0.5 thick polyethylene film 0.6mm geotextile film 0.3mm polyethylene film 0.8 high-density polyethylene geotextile film
1.0mm polyethylene geomembrane, 1.2mm thick high-density polyethylene anti-seepage film, 1.5mm geomembrane root barrier layer
20 high concave convex drainage board, 25 thick plastic drainage board, 30 drainage water storage board, 12 honeycomb water retention and drainage grid sheet