Had my 40 for less than 24 hours. Set it up last night and the meter read 000. Today the meter reads 005. The water has a acidic metallic taste. Did a live chat a few minutes and the zero water rep said this isn't the system for me. Tested my water out of the tap 3 times and got 3 different numbers from the meter. Don't know how accurate the tester is. Going to try fresh water and see if i get the 000 reading again. I will keep the 40 cup unit and get used to the taste i suppose.