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I know I know - get your own RO/DI setup. I plan on getting one in the future. But in the meantime, if you had to choose between LFS or grocery store RO water which do you trust more?
I agree.If the LFS will test the TDS or conductivity of the RO/DI water in your presence then I would say LFS. If not then use bottled distilled water from the grocery store shelf, not a vending machine which may or may not be maintained since they do not have to meet any healtch codes.

