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I don't think their green labled drinking water is RO water. I used it once in my fresh tank and it had one heck of a buffer in it.. had a heck of a time getting it down to 7.0.. also I believe the dkh was up but that is probably ok.
The ro machines in the stores use the local drinking water as a source so if you take your tds with you and check it before buying you should be able to tell the condition of the filter.
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You have to read the labels...depending on where you are located the filtering process is different. Here in the CT area the labels will read "Processed by Reverse Osmosis." I know that the RI Walmarts the green label is not. I as well as 2 others I work with have been using the Green Label RO water for over a year now and have had NO problems whatsoever. TDS reads 0 on both the RO and Distilled.