If a corresponding cell contains the maximum value in the range, the array contains the row number. Otherwise, the array contains an empty string (). The MIN function uses the new array as its second argument and returns the smallest value, which corresponds to the row number of the maximum value in Data.
Water that is too acidic or too alkaline can be detrimental to human health and lead to nutritional disequilibrium. This was demonstrated in a Swedish well water study, which found both pH extremes to be problematic. Your body simply was not designed to drink highly alkaline water all the time.
Although there are many beneficial uses of acidic water -- it is a natural astringent for washing your face, it can relieve dry and itchy skin, it can expedite the healing of skin problems, it can kill bacteria when washing produce, etc. -- a low pH of less than 6.5 can wreak havoc in your home.