Hello there, I had bought the water filter Acala One. The same principle, only smaller. I drink only water or tea but did not want to spend directly 400.- for the major source of Acala, I bought only small. Also thought only that it does not make much difference in taste but I was wrong. We live in the Westerwald and have in any case very clean water of strength. 1 The filtered water tastes very good. No comparison with water from the bottle. One can compare the taste of the fresh spring water. I'm really excited and will soon buy me the great Lotus. (Same maker as Acala) The Optical I like best. The Acala source One I take then when I travel. So I always super tasty water. I can recommend the water filter with a clear conscience. Look at times the video on Youtube - Martin Gayer in conversation with Professor Michael Vogt A star deduction because the container was probably returned goods.