The first and original bentonite membrane intended for waterproofing all underground and buried parts of the structure. In the market name VOLTEX is a synonym for bentonite waterproofing. Unlike other underground waterproofing systems, it is easily and efficiently installed by free laying with only a few additional products and without the need for any welding machines. Once installed and under pressure, it represents a superior active waterproofing that does not allow lateral migration of water even due to a breakthrough. In addition to the standard VOLTEX, there are also variants for installation in seawater conditions and membranes laminated with a PE layer for additional protection.