1.suitable: Biogas 2.Beauty Appearance 3.Enviromental Saving-energy Enviromental Saving-energy Biogas Specialized Desulfurization Tower suitable: Biogas Beauty Appearance Enviromental Saving-energy This products elegent design ,and can use pig waste,Cow dung,Chicken and duck dung,rabbit waste and so on. They are Convenient and friendly, is your good choice !