environmentally friendly. a grated design allows for maximum light penetration; protecting sensitive sea grasses & marine life. total open area amounts to the complete flooring system for docks decks marinas gangways & walkways. easy to assemble maintenance-free & long-lasting! thruflow™ is designed and engineered to be the finished decking surface for docks decks walkways and virtually any indoor or outdoor structure. thruflow™ panels are the ideal choice for:.