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#4564162 - 11/04/17 05:57 PM Distilled vs Purified Drinking Water
The_Nuke Offline


Registered: 07/21/13
Posts: 313
Loc: D/FW Metroplex
I recently drained the radiator in my car and refilled with some 100% HOAT coolant (G-05) and Purified Drinking Water. It didn't occur to me at the time, but what I have used in the past was always Distilled Water (gallon jugs of Walmart's house brand). But it's starting to creep into my head as a possible liability. Anyone ever had issues with using purified drinking water versus the distilled kind?

Maybe I'm making a mountain out of a mole-hill, but my car's engine cooling system is pretty important, given my geographic location and the intense summers I put it through. So if there's going to be a problem later on the down the road from using the purified drinking kind of water, I'd rather just drain the whole system and refill with distilled now while I have the luxury of deciding when/where to do such a task.
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#4564171 - 11/04/17 06:09 PM Re: Distilled vs Purified Drinking Water [Re: The_Nuke]
Quattro Pete Offline


Registered: 10/30/02
Posts: 35965
Loc: Great Lakes
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#4564174 - 11/04/17 06:10 PM Re: Distilled vs Purified Drinking Water [Re: The_Nuke]
bubbatime Offline


Registered: 03/18/08
Posts: 5723
Loc: South Florida
Drinking water has elements in it to make it taste better. Distilled is perfectly clean water.
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#4564183 - 11/04/17 06:18 PM Re: Distilled vs Purified Drinking Water [Re: The_Nuke]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
Distilled water has all the minerals taken out of it. It's the minerals that scale up the inside of radiators.

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#4564192 - 11/04/17 06:23 PM Re: Distilled vs Purified Drinking Water [Re: The_Nuke]
Reddy45 Offline


Registered: 08/15/08
Posts: 3025
Loc: USA
Distilled would be the correct one to use. However, there are some people who insist that Drinking Water is the correct one to use, but they can never provide a scientific answer.

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#4564207 - 11/04/17 06:35 PM Re: Distilled vs Purified Drinking Water [Re: The_Nuke]
The_Nuke Offline


Registered: 07/21/13
Posts: 313
Loc: D/FW Metroplex
Yes, distilled is always better, I get that. In hindsight, i should have noticed i grabbed the wrong kind, but what's done is done. I was wondering if the purified water, while not as god as distilled, could still be good enough. The answer to that is much more nebulous it seems though, so if I want to err on the side of caution, I'll need to do another drain and fill i guess.

Oh well, at least it's not 125F in the garage like it is during summer. Maybe this D&F will be a little easier to get done without stroking out half-way thru...which remind me, I still need to figure out a way to out an a/c unit in there before next summer. That would make life truly worth living for me!

Thanks for the quick replies,
Nuke
_________________________
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#4564211 - 11/04/17 06:42 PM Re: Distilled vs Purified Drinking Water [Re: The_Nuke]
TmanP Offline


Registered: 10/30/15
Posts: 439
Loc: MN
Distilled water is optimal but realistically you will likely never see a difference. Distilled water is, in theory, pure H20, while "Drinking water" probably came out of a municipal source, was filtered, and may have had additional minerals added back for taste. Our GMs spec "clean, drinkable water" in the owners' manual for mixing with the full-strength coolant. So you should be fine. I wouldn't worry. Many people just use water out of the hose.
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#4564213 - 11/04/17 06:46 PM Re: Distilled vs Purified Drinking Water [Re: The_Nuke]
fields Offline


Registered: 04/11/03
Posts: 120
Loc: TX
Go with it. You will be fine.

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#4564215 - 11/04/17 06:49 PM Re: Distilled vs Purified Drinking Water [Re: The_Nuke]
Dumc87 Offline


Registered: 06/05/10
Posts: 591
Loc: Florida
I just went through this yesterday, as distilled water is kind of hard to find locally for some reason. Lots of purified water though. To make the plot even more interesting, a few gallons of purified water had "Purified via deionization and distillation"

So... Perhaps some purified water is even more "pure" than distilled?
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#4564219 - 11/04/17 06:56 PM Re: Distilled vs Purified Drinking Water [Re: The_Nuke]
DBMaster Offline


Registered: 09/18/12
Posts: 5340
Loc: DFW
The "drinking" water is most likely purified via reverse osmosis. I have an R/O system and that's the only water I use for such purposes. The total dissolved solids is VERY low. There is very little added to the drinking water to make it taste less flat. I would not worry about it at all.

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#4564235 - 11/04/17 07:16 PM Re: Distilled vs Purified Drinking Water [Re: The_Nuke]
StevieC Offline


Registered: 08/21/08
Posts: 17116
Loc: Ontario, Canada
Even though I have multiple filters and an R.O. unit I still use distilled water to make sure it's as pure as possible or buy the pre-mix stuff if it's a reasonable price.
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#4564253 - 11/04/17 07:35 PM Re: Distilled vs Purified Drinking Water [Re: fields]
The_Nuke Offline


Registered: 07/21/13
Posts: 313
Loc: D/FW Metroplex
Originally Posted By: fields
Go with it. You will be fine.


You don't happen to work in a shop that sells or services radiators do you??

I'll go ahead and put a mark in the "Leave It" column of the "Change It/Leave It" spreadsheet I've got to tally votes on the topic, but I'm afraid I will need to see some documentation about current employment to make sure you aren't just trying to drum up some future business laugh
_________________________
2012 Dodge Charger
- R/T with pursuit pkg.
- 5.7L + A5 + 2.65
"..it's got cop tires, cop shocks, cop suspension..."

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#4564256 - 11/04/17 07:38 PM Re: Distilled vs Purified Drinking Water [Re: DBMaster]
The_Nuke Offline


Registered: 07/21/13
Posts: 313
Loc: D/FW Metroplex
Originally Posted By: DBMaster
The "drinking" water is most likely purified via reverse osmosis. I have an R/O system and that's the only water I use for such purposes. The total dissolved solids is VERY low. There is very little added to the drinking water to make it taste less flat. I would not worry about it at all.


It could be, but given that I did not buy the premium brand or anything, I would not be surprised if it was actually one of those deals where they just pay some city for their municipal water and resell it without doing anything to it one way or the other. That would be the worst case scenario, sure, but luckily I will not have to worry about it and can actually rest easy now (see next post).
_________________________
2012 Dodge Charger
- R/T with pursuit pkg.
- 5.7L + A5 + 2.65
"..it's got cop tires, cop shocks, cop suspension..."

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#4564258 - 11/04/17 07:45 PM Re: Distilled vs Purified Drinking Water [Re: The_Nuke]
Ethan1 Offline


Registered: 12/29/14
Posts: 1639
Loc: 'murica
Most people don't even change their coolant until something fails in their cooling system. We all need to remember that by simply changing our coolant, we're probably in the top 5-10% of car owners in terms of maintenance.

The same thing applies when have thread after thread full of hand-wringing over when to change our gear oil. Most vehicles probably go to the junkyard with the original gear oil.

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#4564267 - 11/04/17 07:52 PM Re: Distilled vs Purified Drinking Water [Re: The_Nuke]
DBMaster Offline


Registered: 09/18/12
Posts: 5340
Loc: DFW
Originally Posted By: The_Nuke
Originally Posted By: DBMaster
The "drinking" water is most likely purified via reverse osmosis. I have an R/O system and that's the only water I use for such purposes. The total dissolved solids is VERY low. There is very little added to the drinking water to make it taste less flat. I would not worry about it at all.


It could be, but given that I did not buy the premium brand or anything, I would not be surprised if it was actually one of those deals where they just pay some city for their municipal water and resell it without doing anything to it one way or the other. That would be the worst case scenario, sure, but luckily I will not have to worry about it and can actually rest easy now (see next post).


I would be EXTREMELY surprised if the water was not ultra filtered or treated with reverse osmosis. I think far too much emphasis has been placed on the water used to mix coolant.

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