2 Gallon Refrigerator Unit purifies and alkalinizes up to 120 Gallons of water per filter while retaining Beneficial Trace Minerals. Saves money on water and reduce wasteful plastic bottles while drinking delicious alkaline water that is pure. Easy to install and use, the OPTI Chill works by simply filling the top reservoir with water and letting gravity filter through the Ionic Filter. No Electricity or Plumbing required. Naturally Alkalizes water up to 9.0pH Filters Proudly Made in the USA