Saves money on water and reduce wasteful plastic bottles while drinking delicious alkaline water that is pure. Naturally alkalizes water up to 9.0ph 2 gallon refrigerator unit filters and alkalinizes up to 120 gallons of water per filter while retaining beneficial trace minerals. opti water will filter about 1 gallon per 1hour. compared to other competitors we filter slow, but we remove more contaminants. 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. Filters proudly made in the usa