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I have a 4040 going for 8 months now. I have a booster pump and also recycle a percentage of the waste.Inlet is 400ppm Outlet is 3ppm or lower. For every 1 liter pure I waste about .75 of a liter. I can fill my 1000L tank in 5 hours.Pj why don't you invest in a water softener to make the membrane last longer.Simon.