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In Reply to: RE: Record cleaning water questions posted by Da He Hua on February 27, 2017 at 09:50:34
(nt)
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Lab water, reverse osmosis water made from filtered water.. Distilled has more metals in it.
Distilled Water - Salts, sediment, metals - anything that won't boil or evaporate - remain in the distiller and must be removed. Volatile organic compounds (VOCs) are a good example of a contaminant that will evaporate and condense with the water vapor. A vapor trap, carbon filter, or other device must be used along with a distiller to ensure a more complete removal of contaminants.Reverse Osmosis - Reverse osmosis significantly reduces salt, most other inorganic material present in the water, and some organic compounds. With a quality carbon filter to remove any organic materials that get through the filter, the purity of the treated water approaches that produced by distillation.
Notice the last 5 words.
Edits: 02/28/17
Fair enough on the distinction and text book level of purity of R/O v. Distilled water. I still can't agree with it based on both practice and what every lab guy I've ever spoken too has said. I used to work for a chemical company. What my real gist is, is to say that, lab grade water.. like the stuff I use (see link below), is not only distilled and re-processed through R/O, but it claims the following:
"..Essentially free from organic and inorganic particulate and soluble contaminants
Use in place of deionized or distilled water to improve control in critical diagnostic procedures
Contains no preservatives. For in vitro diagnostic use and laboratory use only
Not for infusion, injection or irrigation".
You cannot say in all seriousness, that some generic gallon of unknown provenance.. picked up off the shelf at Walgreens is more free of particulate than this stuff is. At $40 per 5 gallon "cube-tainer" plus nominal shipping, it's not even insanely expensive. A bargain compared to something like MoFi SVW as a final rinse.. and IMO, it actually works a lot better. My last one lasted over 5 years and I clean plenty of records.
Point is.. There is distilled and there is H2O that has gone through more rigorous purification for lab use and is industry certified as such. After 6 months to a year, the container I've bought is not fit for lab use any more.. but it kicks butt as a final rinse and mixable for all my record cleaning stuff. I used to buy gallons of drug store distilled and use in an early rising step.. but the first quantity of lab water I bought lasted for so long.. that I just use it for all water uses now.
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