Industrial Top Projects. What is Aeration for Wastewater Treatment? Corrosive Reverse Osmosis Finished Water. Learn more. Why is RO water more corrosive? Ask Question. Asked 1 year ago. Active 1 year ago. Viewed times.
Improve this question. Rarely Overheated? Really Outdated? Further corrosion of the carbon steel causes copper plating to flake from the surface. A copper pipe corroding in RO water would appear different. The corrosion would be much less obvious because it would be so even. It would take long enough that if you were using purely visual cues to determine corrosion, you might come to the erroneous conclusion that corrosion was not taking place.
Found good info and thought i would paste here. The Output feeds my Ice-maker and my Instant hot through copper pipes I was worried about corrosion and possible leaks and the below paste makes me feel better! The simple answer to your question is yes. Copper plumbing that is exposed to RO water will cause pitting; however, the question begs for a more thorough explanation of whole-house RO. To begin with, when most people hear the term RO, they think of water that has had the mineral salts reduced by 99 percent.
While this is good for life support water, this is not practical for domestic,whole-house, working water. It is good to keep in mind that the water for this type of application should have a finish TDS of ppm. The product water off the membrane should pass through a small column of calcite or equivalent product, or it can be treated with soda ash to neutralize the acidic nature of the water to a less corrosive state.
Bear in mind that these products must meet the NSF standard for food service. In addition to neutralizing the acid, calcite will add calcium carbonate to the water. If the water being treated by the RO still contains hardness, then an acid feed is generally needed to drop the pH to increase the solubility of the hardness. This will allow the membrane to reject high levels of hardness while preventing scaling.
Therefore, passing the water through a softener to remove any remaining hardness is a very efficient way to provide the kind of working water that most homeowners would like in the first place. I have not measured the PH of the RO output recently, but when i last measured it it was right around 7. I was actually thinking about that but i was not aware of the EPA action level and how to measure it. This alone is reason for concern. There are very few drinking-water heaters that are rated for RO water.
The ones that are rated for RO water use stainless steel tanks and tubing. The ones that aren't use carbon steel tanks and copper tubing. Okay, maybe not, but you are making me think I should just pull the RO line off the instant-hot and feed it tap water from under the sink ugh.
Even if i were to hack the instant hot with a hot-water rated poly-line, the internal tank would still be susceptible to corrosion and the RO water may strip it and contaminate my drinking water. Maybe ill put a cheapo standard filter under the sink just for the instant hot. I'll replace the copper line to the refrigerator with RO rated poly to be safe.
Its hard to find real data from educated people on this subject. If it were my house, I would either plumb tap water to the existing instant-hot or replace it with one that is RO rated.
I can speak from personal experience about some of the issues you may encounter. There was also a recirculate adjustment to send a percentage of the effluent back through the system, depending on the TDS of your source. At ppm source, I was able to get 4 gallons of RO water for each gallon of waste water in about 1 minute. That made the economics work out usably. That was a problem! I ended up bypassing original source water by the RO system to dilute the RO water to achieve around ppm TDS, which seemed to not leach copper anymore from the plumbing.
This is critical, as too much copper in your body can cause a variety of health issues that would be otherwise difficult to diagnose trust me on this. According to Wikipedia , the suggested safe level for copper in drinking water is 2ppm, not ! If your source has highly objectionable content, you'd want a different solution.
Unfortunately, this only lasted a short while until I figured out issue 2 above Like you said, very unscientific test. You should have a control group. Put an identical piece of pipe in unfiltered tap water and compare results. Your HS science teacher will be very disappointed.
It is unfortunate that you can no longer see the pictures. They were not really copper straps. They were metal straps coated with a thin layer of copper. Join two dissimilar metals, add a little water, and you have set up a circuit that can lead to some serious corrosion. Understanding terminology like electrolysis and galvanic reaction would tell you that the same thing would have happened no matter what type of water was used. It also explains why metal straps for copper pipe are coated in copper to begin with.
In the absence of any random dust storm, the "sweat" on the outside of a copper pipe is just as pure as RO water. If you dont want to worry about metal being damaged by RO water just add a remineralization filter after your RO. Indem Sie weiterhin auf der Website surfen bzw. Mehr erfahren.
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Students Click Here. Related Projects. Why so aggressive and what to do about it? Great machine, much less maintenance than the old Evaporator Distillers. However, although the water is very clean, it gets very aggressive and corrodes Steel Pipes, Aluminium coolers, Coffee machines, taps, valve seats, Expensive Variable Frequency Drives fresh water cooled even in systems like engine cooling water with corrosion inhibitor mixed into it, it eats up a aluminium radiator in a few months. I have done some research, and it seems to be due to "lack of minerals or Ions" it will absorb that from wherever it can get it, pipes coolers etc.
The pH is 7. Very low salts or chlorides. How do I stop it? Can a mineralizer make it "neutral" or mild again? Can I save our Carbon Steel pipe work, even though it is corroded inside?
Regards, RP. The water is oxygenated, has a low pH, and lacks minerals. The low pH is caused by dissolved carbon dioxide, the same chemical that provides the fizz in coca cola. You best option is to use a neutralizing filter, which will add minerals and raise the pH.
You can also install a chemical feeder but that may be difficult if you have a small system. There is not much that you can do with the piping. Plastic pipe is also acceptable for potable water use. The pH is higher than I first mentioned between
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