Hi Jiffster. I'm using distilled water I buy at Walmart on my new Pro+ meter like yours. I am going to follow your thread to see if I am making a mistake, but I haven't seen Deionized water in stores that I am aware of. Maybe I just overlooked it. From what I have read, distilled water can be substituted for deionized water for most practical purposes. I hope our use is one of those acceptable substitutions.Can I just use Kroger distilled water or do I need to find deionized water?
If so, where?
I'm using a Hach Pocket Pro+ meter.