Just a quick follow up. I did a lot of searching last night, and could not find a single government or university study that stated DI water is safe to drink. I would agree with Dan's statement about the resins being part of the reason. I did find a lot on the problems associated with plumbing for DI water, though. Apparently DI water will eat through copper pipes (maybe because pH tends to be towards the acidic side?). Doesn't sound healthy to me. I also noticed some water bottleing companies who claim DI water is safe to drink, although they also add minerals "to improve taste".
hi.
Do you know the name of the bottler that DIs water, and then add mineral to it? I will be interested to know it.
pH of ultrapure water is a tricky thing to define. I will also be interested to know what problem does DI water have on copper pipe. All facilities that have centralized DI production plant (that I am aware of) use plastic pipe and faucet exclusively.
Do you know the name of the bottler that DIs water, and then add mineral to it? I will be interested to know it.
pH of ultrapure water is a tricky thing to define. I will also be interested to know what problem does DI water have on copper pipe. All facilities that have centralized DI production plant (that I am aware of) use plastic pipe and faucet exclusively.
for a discussion on the corrosive effects of DI water on plumbing, see
[http://www.eng-tips.com/gviewthread.cfm/lev2/7/lev3/37/pid/798/qid/29596]
As for a specific bottler of DI water that has been "re-mineralised", I can not recall which company it was that I found (2 hours of searching will do that), but I believe the above discussion does mention it.
Dave
[http://www.eng-tips.com/gviewthread.cfm/lev2/7/lev3/37/pid/798/qid/29596]
As for a specific bottler of DI water that has been "re-mineralised", I can not recall which company it was that I found (2 hours of searching will do that), but I believe the above discussion does mention it.
Dave
hi.
Thanx for the link.
The thread you give only mentioned bottler that use commerical RO process. I am highly doubtful that any bottler with a general consumer in mind would want to use RO/DI process because of the cost. But I have been wrong many many times, so let me know if you know such company. There is a confusion between deionized and demineralized water in the thread, if you notice. Demineralized is used by at least one of the posters there in reference to RO process. DI is specifically refers to the use of cat/anion resin used in water purification.
The "corrosion" is in quote because it is not an electrochemical process when they use the term with DI water's effect on metal. This is closer to "dissolution" than "corrosion," but either terms are used loosely.
As mentioned, pH of ultrapure water is hard to define, because of the lack of proton (hydronium ion) and OH- in the solution. This is also mentioned in the thread you mentioned. I guess for high pressure process, the engineer would use SS316 for plumbing, but for regular centralized DI plant, plastic is usually used (some good for pressure up to 200psi). If a facility has the money for DI plant, it is not going to skim by using copper pipe.
Thanx for the link.
The thread you give only mentioned bottler that use commerical RO process. I am highly doubtful that any bottler with a general consumer in mind would want to use RO/DI process because of the cost. But I have been wrong many many times, so let me know if you know such company. There is a confusion between deionized and demineralized water in the thread, if you notice. Demineralized is used by at least one of the posters there in reference to RO process. DI is specifically refers to the use of cat/anion resin used in water purification.
The "corrosion" is in quote because it is not an electrochemical process when they use the term with DI water's effect on metal. This is closer to "dissolution" than "corrosion," but either terms are used loosely.
As mentioned, pH of ultrapure water is hard to define, because of the lack of proton (hydronium ion) and OH- in the solution. This is also mentioned in the thread you mentioned. I guess for high pressure process, the engineer would use SS316 for plumbing, but for regular centralized DI plant, plastic is usually used (some good for pressure up to 200psi). If a facility has the money for DI plant, it is not going to skim by using copper pipe.
Hi!
Yes I did notice some of the confusion in the thread. This was just one of the sites of many that I found, but in general, there is confusion everywhere you look on this topic. I guess I never thought this would turn into a chemistry lesson, but I enjoy a good debate!
Getting back to my original post in this thread, I still stand by my opinion that DI water is probably not safe to drink. I think the fact that there is so much debate on this issue says something. Add in the effects DI water has on metals, and I think anyone should think twice. (Then again, I have heard of many high school science experiments in which Coca-Cola has eaten through asphault 8O
)
Thanks for your feedback!
Dave
Yes I did notice some of the confusion in the thread. This was just one of the sites of many that I found, but in general, there is confusion everywhere you look on this topic. I guess I never thought this would turn into a chemistry lesson, but I enjoy a good debate!
Getting back to my original post in this thread, I still stand by my opinion that DI water is probably not safe to drink. I think the fact that there is so much debate on this issue says something. Add in the effects DI water has on metals, and I think anyone should think twice. (Then again, I have heard of many high school science experiments in which Coca-Cola has eaten through asphault 8O
)Thanks for your feedback!
Dave
:roll: I'll pass, Thanks!
Actually this has been fun, and if I didn't have a couple more pressing issues, I would like to continue.
Maybe you would like to enter into a new (old) debate on whether or not it is possible to overskim a tank? Look for my post later this evening.
Dave
Actually this has been fun, and if I didn't have a couple more pressing issues, I would like to continue.
Maybe you would like to enter into a new (old) debate on whether or not it is possible to overskim a tank? Look for my post later this evening.
Dave
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