I bought ZeroWater for my sons birthday and when we filled it up and proceeded to drink the water the taste was HORRIBLE. It had a VERY STRONG  odd acid citrus taste to it. When we put the tester in it, it registered 143..never used, new filter. His tap water tastes NOTHING like that.  I have one and I have used it and love it. Suggestions as to what the problem could be? He is not using it at all. I was going to throw it out, but really don't want to wastes the money.