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Why NOT to use distilled water in your cooling system

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turbo nasty

Turbo Dojo / MNTR
Joined
Jul 19, 2001
Messages
9,478
Found soem very good info on why not to use Distuilled water in the cooling system. Especially straight. I will be draining mine ASAP!:eek:

What type of water is best to use as coolant?

Many people have heard that distilled water is best to use in a cooling system. This is wrong, unless a mix of 50/50 antifreeze is used. While it certainly is true that distilled water’s purity prevents electrolysis and scale/deposit formation, it unfortunately comes with a potentially very damaging side effect. During the distillation process, water is vaporized into it’s gaseous phase, so all impurities are left behind. These impurities include a number of minerals, including calcium and magnesium – the two components of “hardness.” The water is then condensed back into it’s liquid phase, so the resulting liquid is pure water – in fact, some of the purest water on earth. The problem is that when water is distilled, or “stripped” of impurities, the resulting solution is composed of chemically imbalanced “ions.” This leaves distilled water “electrochemically hungry,” so it will actually strip electrons from the metals in a cooling system as it attempts to chemically re-balance itself. As it chemically removes electrons from the cooling system metals, it does damage that will eventually lead to leaks and system failure. Using distilled water in combination with 50% antifreeze is no problem, because the distilled water will seek and find electrochemical balance from the various chemical ingredients in the antifreeze mixture. But using distilled water as straight water coolant is strongly discouraged.

The best type of water to use as coolant is softened water – especially if you run straight water coolant, without antifreeze. During the water softening process, the same impurities and minerals are removed from water as the distillation process – but with one very important distinction. Rather than STRIPPING the impurities from water, softening EXCHANGES the impurities with a sodium ion. The resulting solution is electrochemically stable and ionically balanced, making softened water very stable, pure, and non-threatening to cooling system metals. It should be added, there seems to be a perceptual issue with regard to usage of softened water. Many mistakenly believe that because SALT is added to water softeners, softened water must contain salt, a substance known to be very corrosive. Nothing could be further from the truth. The salt that’s added to a water softener is NaCl, or sodium chloride. During the softening process, only the sodium ion is exchanged into the water, whereas chloride ions are removed when the softener is regenerated. Therefore, softened water does NOT contain corrosive salt.


What are the benefits of using softened water?


Soft water lacks the impurities of tap water. When used as coolant, it will not act as an electrolyte, thereby minimizing damage from electrolysis. And it will not form antifreeze gels and scales/deposits, which reduces the possibility of eventual overheating. However, it should be noted that regardless of whether tap water or softened water is used, No-Rosion prevents these types of damage. This is one of the important benefits of the product, since not everybody has easy access to softened water at all times.
 
I've been running Distilled and RMI25 for many years now without any issues!

No complaints here. :cool:

Dannyo
 
WHAT!!!!!! Man, I drink distilled water!!! Am I in trouble? (I know i've been feeling kinda woozy lately:smile:)
I use No water in the Buick I use Evans engine coolant 100%.
Now the truck and the wife's car more like a 70/30 of distilled and coolant.:smile:
 
WHAT!!!!!! Man, I drink distilled water!!! Am I in trouble? (I know i've been feeling kinda woozy lately:smile:)
I use No water in the Buick I use Evans engine coolant 100%.
Now the truck and the wife's car more like a 70/30 of distilled and coolant.:smile:
I'm glad to see someone else here using Evan's also. Pricey, yes, but I feel good knowing it's in there.
 
When ever I've used distilled water it was also de-ionized.

NEVER use de-ionized water :eek: I work in the electonics industry where we use DI water extensively. DI water is very corrosive to metals. All our DI water lines, pumps, and tanks are made out of plastic, PFE, PFA, ect. for this reason. I have seen DI lines where someone mistakenly put in a metal fitting and within a year was corroded through.
 
NEVER use de-ionized water :eek: I work in the electonics industry where we use DI water extensively. DI water is very corrosive to metals. All our DI water lines, pumps, and tanks are made out of plastic, PFE, PFA, ect. for this reason. I have seen DI lines where someone mistakenly put in a metal fitting and within a year was corroded through.

Wrote that wrong. I was thinking of an experiment I once did in school with de-ionized water. De-ionized is bad but I thought ionized wasn't?
 
How many miles do you put on your car a week and year?

I don't put much miles on the car anymore. Usually cruise on weekends only and when I take it to the strip.

I think Nick in AZ has used it more in this fashion so he might be better in giving his .02 than me.

Dannyo
 
The Soduim Cloride way is what a few people i know use in their swimming pools a cheaper safer alternative than chlorine.




I just use tap water and rmi-25 with no problem for yrs. my radiator is about 10 yrs old now and looks like new inside.
 
What about RO water? Its about the purest water around. Also anyone know of a good coolant system flush? Radiators a little corroded.
 
I don't put much miles on the car anymore. Usually cruise on weekends only and when I take it to the strip.

I think Nick in AZ has used it more in this fashion so he might be better in giving his .02 than me.

Dannyo

Cool reason I ask is I have put about 40k on mine with rmi and distilled. Heater core, water pump and radiator had to be repalced and they were not that old and in great condition. Just sprung leaks at the seams where joined. Im thinking it was the distilled h20...just a thought
 
Found soem very good info on why not to use Distuilled water in the cooling system. Especially straight. I will be draining mine ASAP!:eek:

What type of water is best to use as coolant?

Many people have heard that distilled water is best to use in a cooling system. This is wrong, unless a mix of 50/50 antifreeze is used. While it certainly is true that distilled water’s purity prevents electrolysis and scale/deposit formation, it unfortunately comes with a potentially very damaging side effect. During the distillation process, water is vaporized into it’s gaseous phase, so all impurities are left behind. These impurities include a number of minerals, including calcium and magnesium – the two components of “hardness.” The water is then condensed back into it’s liquid phase, so the resulting liquid is pure water – in fact, some of the purest water on earth. The problem is that when water is distilled, or “stripped” of impurities, the resulting solution is composed of chemically imbalanced “ions.” This leaves distilled water “electrochemically hungry,” so it will actually strip electrons from the metals in a cooling system as it attempts to chemically re-balance itself. As it chemically removes electrons from the cooling system metals, it does damage that will eventually lead to leaks and system failure. Using distilled water in combination with 50% antifreeze is no problem, because the distilled water will seek and find electrochemical balance from the various chemical ingredients in the antifreeze mixture. But using distilled water as straight water coolant is strongly discouraged.

The best type of water to use as coolant is softened water – especially if you run straight water coolant, without antifreeze. During the water softening process, the same impurities and minerals are removed from water as the distillation process – but with one very important distinction. Rather than STRIPPING the impurities from water, softening EXCHANGES the impurities with a sodium ion. The resulting solution is electrochemically stable and ionically balanced, making softened water very stable, pure, and non-threatening to cooling system metals. It should be added, there seems to be a perceptual issue with regard to usage of softened water. Many mistakenly believe that because SALT is added to water softeners, softened water must contain salt, a substance known to be very corrosive. Nothing could be further from the truth. The salt that’s added to a water softener is NaCl, or sodium chloride. During the softening process, only the sodium ion is exchanged into the water, whereas chloride ions are removed when the softener is regenerated. Therefore, softened water does NOT contain corrosive salt.


What are the benefits of using softened water?


Soft water lacks the impurities of tap water. When used as coolant, it will not act as an electrolyte, thereby minimizing damage from electrolysis. And it will not form antifreeze gels and scales/deposits, which reduces the possibility of eventual overheating. However, it should be noted that regardless of whether tap water or softened water is used, No-Rosion prevents these types of damage. This is one of the important benefits of the product, since not everybody has easy access to softened water at all times.
This is true, but you never mentioned anything about the other ingredients that MOST of us run in our cars. Like "Waterwetter, RMI-25" or any of the other cooling additives. So while this may be true with ONLY distilled water Most of us do use some sort of additive along with distilled water making it just fine to run because the distilled water still will seek and find electrochemical balance from the various chemical ingredients in the Waterwetter or RMI-25 mixture. Correct?
 
Iv'e been running distilled water and RMI-25 in my car for 10 to 12 years.
I have a CAS aluminum radiator also that's years old and my rad still looks new inside. Car has original heater core and at least 60 thou. on this set up and Iv'e yet to have any problems. ZERO. I think it's the RMI-25 that Nick introduced me to YEARS ago.?? I do flush the system every other year and put in fresh water and RMI- 25.
 
NEVER use de-ionized water :eek: I work in the electonics industry where we use DI water extensively. DI water is very corrosive to metals. All our DI water lines, pumps, and tanks are made out of plastic, PFE, PFA, ect. for this reason. I have seen DI lines where someone mistakenly put in a metal fitting and within a year was corroded through.

I made the mistake of putting DI water in my coolant system, thinking i was doing something good. Good lord---it rusted everything in sight--had to throw the radiator away. The coolant passages in the motor were just horrible--very corrosive stuff:(


Geoff
 
This is true, but you never mentioned anything about the other ingredients that MOST of us run in our cars. Like "Waterwetter, RMI-25" or any of the other cooling additives. So while this may be true with ONLY distilled water Most of us do use some sort of additive along with distilled water making it just fine to run because the distilled water still will seek and find electrochemical balance from the various chemical ingredients in the Waterwetter or RMI-25 mixture. Correct?

The info is from a site and info is based off using it with a aditive called norosion. It seems to be similar to RMI.

From what I gather from talking with some guys in water treatment at work that deal with water in treatments, etc. The ratio for RMI25 to distillilled water isnt enough to offset the imbalance. Best to use the water recommended in the article w/RMI25.

I drive mine alot on the highway for trips. The sustianed circulation at speed will speed the negative process. TVehicles with Car show, drag runs, weekend and sunday cruises with low miles racked up will cause the negative effects to be slower and folks will think all is peachy.
 
Iv'e been running distilled water and RMI-25 in my car for 10 to 12 years.
I have a CAS aluminum radiator also that's years old and my rad still looks new inside. Car has original heater core and at least 60 thou. on this set up and Iv'e yet to have any problems. ZERO. I think it's the RMI-25 that Nick introduced me to YEARS ago.?? I do flush the system every other year and put in fresh water and RMI- 25.

How many miles have you put on your car in the length of time?
 
nick at azgn.com
or in the north east , jack at cottonsperformance.com
 
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