I've distilled about 20 gallons (20 cycles) of well water so far. I actually really like this thing. It's easy to clean and maintain. Our well just has a basic whole house charcoal filter on it... so when we run a cycle through this thing, there's usually a fair amount of sediment at the bottom. Gross! My digital PPM tester consistently tests at 001 to 002. The water tastes plain, like it should, to me. Some tips if you buy this. Fill it with hot water, which takes less time to heat up. If you get used to when it goes off, unplug it prior to the end of the cycle so you get less calcification build up to deal with. Place it someplace where adequate air flow occurs so it helps cool. (I stuck it in the corner between microwave and kithenaid, it got hot and produced only 3/4 gallon of water as where on the open counter it does a full gallon). Make sure whatever you store water in is safe for distilled water, as it tends to leach certain plastics. Great product for price!