This vortex Ring air blower is widely used by compost tea brewers and fish traders.Performance with Reliability,Cast aluminum housing with a high Phosphorization finish.Fully retained impeller prevents vane fracture and pump failure.Special annual chamber contains smooth airflow, without producing much noise. Aluminum housing provides excellent heat,dispersion, and prevents over-thermal. Filter lid for inlet is provided to prevent the impeller clogged by the dust and solids.Silencer for outlet is provided.Oil-free output allows it to be applied in aquaculture, fish farming, pool bubble, and healthcare. It also can be run as a vacuum pump.