<p>Blue Diamond ET80 Septic air pump aerator is most commonly used is 500 gpd aerobic septic systems and this unit comes with a bonus extra air filter. Enviro linear air blowers/aerators are designed for use in residential aerobic treatment units/ATU's. Other applications include pond aeration, hydroponic grow systems, compost brewers and packaging machines. Performance 30 to 250 l/min flow Green drive technology - energy efficient motors low power consumption Specially formulated diaphragm material for extended life Flow rate up to 80 l/hr Due to no wearing parts no reduction in performance Robust and company construction - weatherproof Easy to service with competitively priced spares kit Suited to intermittent and continuous duty applications Whisper quiet operation as low as 35dB Used by original equipment manufacturers of NSF certified residential sewage treatment systems UL, TUV and CE approved Blue diamond ET80 aerobic septic air pump.</p>