Its a reverse osmosis machine. You can get them for as low as $100 on amazon or anywhere. I have one at the house attached to my sink that makes about 20 gallons a day on demand and a small commercial one at work that cost 220 and makes 500 gallons a day (its about 2sqft in size) filling a large tank. Neither are large nor high in electric usage, the home one has no power, the small commercial has a small booster pump. Its the water usage that is high, to get a gallon of pure ro water is about 1.5 to 2.5 gallons of "waste". You can use that waste for watering the lawn or rinsing things but its extremely mineral heavy. You dont clean them just replace the filters every so often (not nearly needed as often as recommended)