I am glad this time you decided to test the water, I used to buy R/O water from LFS but decided to stop b/c of fear that they could mix it up with salt water. I feel safer with Walmart distilled and I still test every single gallon
Ya, think I'm going back to buying it from the Hardware store and their machines or just buying 1 gallon distilled sealed jugs. I never had a problem there before or with the sealed jugs.
My population took a hit over the summer due to several things and personal issues, and now it's just getting back, I would have been crushed to loose them all to some kids fault who put the wrong hose and opened the wrong valve in a jug.
Warning for everyone, always TDS test your RO from anywhere. You never know if the machine is acting up or a situation like this.