Sure-Grip concrete liners from Agru America are designed for aggressive and abrasive media inside tanks, pipes and other structures. When combined with distance sheets, the protective liners meet requirements for storing environmentally hazardous media. Joined by ultrasonic welding, the space between the two sheets permits monitoring for leak detection. The surface pattern also facilitates self-cleaning for reduced sedimentation. 800/373-2478; www.agruamerica.com.