... mat is widely used for kio and big pools water filtration. Thickness:3.8 or 4.5cm,Color:green/white ... middle-laying filter material.Features:1. good water resistance,light resistance,excellent water and air permeability,flame resistance2. washable , ... room2).filtration of central air-conditioner pipeline,collecting water and reducing noise,separate oil and water.3).water disposal factory,tap water ...