Just another thought--- we buy ACETIC ACID professional manufactured and sold in plastic bottles, it is the same as mixing but exact .... only thing is it will cost more but lasts a long time anyway. Also this and the bottles of sterile water we have bought give the expiration date. Just pour amount needed in cup or bowl.........and your bigger bottles of these products can last quite a while.
                                       Hope this may be of help..........   *Dan*

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