Fully permeable backing is designed to let water pass through a broad portion of the turf backing rather than primarily through spaced drainage holes. Actual installed drainage still depends on infill, base, subgrade, slope, and a discharge path.
Infill is granular material distributed between artificial-grass fibers after installation. Depending on the system, it can add ballast, support fibers, influence surface feel, and contribute to sport, pet, or maintenance performance.
Perforated backing is artificial-turf backing made with regularly spaced holes that allow water to pass through at those points. Hole size and spacing vary by product, and the complete installation determines real-world drainage.
Turf backing is the layered material that carries and secures artificial-grass fibers. Primary backing supports tufting; a secondary coating helps lock fibers in place and contributes to dimensional stability and drainage design.