Goldentech Disc/Tube Diffusers are high efficient and durable for all applications. Fine bubble disc/tube diffusers help to increase dissolved oxygen in aeration tank and fish ponds. There's also coarse disc diffuser for stirring the wastewater ponds. Diffusers are connected to PVC pipes and to roots blower (roots pump) to provide air to the ponds. Our diffusers are made of EPDM and ABS which give them lower chance to rot.