BENTONITE MEMBRAINE ALSO KNOW AS GCL MEMBRAINE (GEOSYNTHETIC CLAY LINER), is produced by needle-weaving technology and formed by a layer of bentonite sandwiched between 2 layers of geotextile, with high swelling properties, it will creat waterproof capabilities, often used in enviromental applications, it has a waterproof effect of 10-100 time smaller than compacted clay layer 60-90cm thick.