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#4529500 - 09/29/17 03:28 PM what water to mix with antifreeze
old1 Offline


Registered: 01/04/11
Posts: 999
Loc: Columbus Nebraska
As the title says, If using plain old green antifreeze in my classics, would my reverse osmosis water be as, or nearly as, good as distilled water to mix with full strength antifreeze???. Years ago, I used nothing but plain tap water and never had any problems, but then I seemed to get a different car every 2 or 3 years also. Not because of problems, but just something different caught my eye.
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#4529504 - 09/29/17 03:36 PM Re: what water to mix with antifreeze [Re: old1]
skyactiv Offline


Registered: 03/02/13
Posts: 4394
Loc: The Midwest
Buy a "Zerowater" pitcher at a Wal-Mart store.
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#4529507 - 09/29/17 03:38 PM Re: what water to mix with antifreeze [Re: old1]
Reddy45 Offline


Registered: 08/15/08
Posts: 2963
Loc: USA
Distilled. Contains little to no TDS so it's pure H2O.

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#4529511 - 09/29/17 03:46 PM Re: what water to mix with antifreeze [Re: old1]
Lolvoguy Online   sleepy


Registered: 02/06/14
Posts: 2330
Loc: Canada
I've heard De-mineralized is the stuff you want.

Been working great on my cars.
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#4529514 - 09/29/17 03:48 PM Re: what water to mix with antifreeze [Re: old1]
HoosierJeeper Offline


Registered: 11/23/16
Posts: 1276
Loc: WI
I've just used plain distilled water. Cheap and easy to get.
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#4529515 - 09/29/17 03:48 PM Re: what water to mix with antifreeze [Re: old1]
mightymousetech Offline


Registered: 04/03/17
Posts: 1444
Loc: Ontario, Canada
Distilled is the most pure, and is really cheap. You can get it at the drug store for $1 a gallon. It is meant for use in CPAP machines and humidifiers etc.
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#4529519 - 09/29/17 03:51 PM Re: what water to mix with antifreeze [Re: old1]
kschachn Offline


Registered: 12/26/05
Posts: 9390
Loc: Upper Midwest
De-mineralized is a generic term for water with "hardness" ions removed, it can be accomplished in a variety of ways including distillation and reverse osmosis. Either one of those is fine for this use.

Even your tap water can be fine but it depends on the locality. When I lived in the City of Milwaukee the water there was extremely low in TDS and was fine for cooling systems. But here in the suburbs where it comes from a well it is completely different, it has a high hardness value and I'd never use it for cooling systems or batteries. I think the distilled water at Walmart is under $1 a gallon, that is about as cheap as it gets.
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#4529520 - 09/29/17 03:51 PM Re: what water to mix with antifreeze [Re: old1]
BlueOval83 Offline


Registered: 09/25/17
Posts: 13
Loc: USA
Distilled water. You can get it from Kroger for less then a dollar per gallon
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#4529524 - 09/29/17 03:57 PM Re: what water to mix with antifreeze [Re: old1]
rollinpete Offline


Registered: 03/20/17
Posts: 447
Loc: West Ma.
Flush the system with some water, drain and refill...I guess i'm going to be wrong here but I take the garden hose and fill as needed after one gallon antifreeze... allways works for me... No need for distilled anything... hide use prestone full strength mixed with your water...


Edited by rollinpete (09/29/17 04:00 PM)
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#4529559 - 09/29/17 04:31 PM Re: what water to mix with antifreeze [Re: old1]
Bud Offline


Registered: 06/04/02
Posts: 1715
Loc: Texas
I have always used distilled.
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#4529562 - 09/29/17 04:34 PM Re: what water to mix with antifreeze [Re: old1]
nthach Offline


Registered: 01/02/04
Posts: 3892
Loc: California
Distilled/DI to be safe. If your local water isn't too hard that works as well.

Hard water was reason for the Europeans not liking phosphated coolants - phosphate ions do bind to calcium and magnesium ions and take it out of solution, causing precipitate.

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#4529574 - 09/29/17 04:52 PM Re: what water to mix with antifreeze [Re: old1]
Gebo Offline


Registered: 09/18/02
Posts: 2079
Loc: VA
I have a reverse osmosis system for my saltwater fish tank. It is absolutely perfect for your coolant mixing. It removes all minerals.

Something I did was use an empty gallon milk jug and pour 1 qt of water in it. Take a marker and make a line at that water level. Pour another qt of water and mark that level, etc. I ended up with lines ar 1,2,3 and 4 qts. Then it was so easy to make my 50:50 mix of coolant and be consistent in adding it to my coolant system. Id wait and fill up my reservoirs last.
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#4529600 - 09/29/17 05:18 PM Re: what water to mix with antifreeze [Re: old1]
HerrStig Offline


Registered: 08/24/11
Posts: 9560
Loc: Boston, MA
If you keep the bucket of your dehumidifier clean you can use the "distilled" water from it.

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#4529601 - 09/29/17 05:19 PM Re: what water to mix with antifreeze [Re: kschachn]
zrxkawboy Offline


Registered: 11/30/04
Posts: 1761
Loc: SD
Originally Posted By: kschachn
De-mineralized is a generic term for water with "hardness" ions removed, it can be accomplished in a variety of ways including distillation and reverse osmosis. Either one of those is fine for this use.


/\ this
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#4529647 - 09/29/17 06:02 PM Re: what water to mix with antifreeze [Re: old1]
ArcticDriver Offline


Registered: 01/27/17
Posts: 1139
Loc: USA
De-Ionized is what many coolant manufacturers instruct right on the jug.

Personally, I have found that melted glacial ice taken from core samples at a depth of about 70-73 meters work best.
Fijian water is a distant second.


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