Profile: Lytag Limited specializes in providing lightweight aggregates. Lytag® LWA is a versatile, lightweight aggregate produced from pulverized fuel ash (PFA), a by-product of coal-burning power stations. It is an ideal medium for land drainage applications. It's rounded shape and regular grading give hydraulic conductivity. It is used for pipe bedding with drainage systems, as required in specifications such as EN 1610, and the highways specification.