This video shows a porous concrete pipe, commonly used in drainage and stormwater management systems. Unlike regular concrete, porous concrete has a high void content, allowing water to flow through it naturally. This makes it ideal for sub-surface drainage, soakaways, wells, and groundwater recharge systems. The white powder you sometimes see on concrete is efflorescence—a harmless salt deposit that appears when moisture evaporates through the material. While not dangerous, it can indicate that