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My tanks can't get under about 40 right now because of the high tap nitrates, so I have to do about 3 PWC's a week. This happens for about 2 months every year in my area and then the tap goes back down.
Last house I was in had about 10-20 ppm Nitrates out of the tap as well. Its really frustrating watching the tank levels sit at 40-80 ppm all the time.