Even though I already know that purified water is acidic, but the water test still shocks me, the yellow result is from the purified bottle water, and the green one is from the filtered water from my home's machine (the machine keeps good minerals and filtered out heavy metal), It tells us that we need to reduce purified water daily, since it doesn't have any minerals, and we have 70% water in our bodies, the more pruified water the more acidic body fluid will be, and it won't make you a healthy body.