Great function! I have used mine for several months now, and have run at least 3 gallons per day through it. My distiller works very reliably without fail, no waste, or hassle, (just needs a good rinse of hot water to flush all the left-over crud and sludge from the nasty tap water, every once in awhile). This is normal, and the reason we use a distiller, to avoid the poisons, toxins, sludge, pharmaceuticals, pollution, chlorine and flouride that is dumped, or winds up in the water supply!