Introducing Global Water Solutions composite tanks. Flow Thru™ composite tanks incorporate a proven, patented membrane suspension (CAD2). The CAD2's steel clamping ring regulates membrane movement and prevents membrane friction against the tank wall. The Flow Thru™ tank is also an ideal option for users of constant water pressure systems who are looking for a solution to store water without the risk of rotting. The C2-Lite CAD™ series represents the proven performance of the GWS steel tank in a lightweight composite design. Efficient and cost-effective, C2-Lite CAD tanks are designed with the patentedGWS Challenger™ controlled-effect membranetank design.