This high quality product is a great tool to assist your filtration system. Specifically cut and tailored to fit an overhead filter tray, you can put it easily in the tray and use it conveniently! It is durable and washable and works well especially if you have a heavy duty filtration system.Tired of cutting filter cotton and causing too much waste? Afraid of having to build new bacteria over again? Just choose to use Pro-Feed Magic Blanket! Works magic for every filtration system!