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Old 16-08-2022, 08:48   #1
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Potable water anti-freeze tester

Has anyone found an anti-freeze tester for potable water? With the number of loops on a modern cruiser it would be great to know what the freeze temperature is after adding fresh water anti-freeze as it is impossible to drain all the water out of the lines before adding anti-freeze. It can get expensive running anti-freeze until it runs pink or purple as water in the line dilutes it. Alternatively, does anyone know what a hydrometer should read for 0 degrees F?
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Old 16-08-2022, 09:43   #2
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Re: Potable water anti-freeze tester

Out of the jug it starts to freeze at 0F. I've had unopened jugs freeze solid at -15 or so. I would not depend on any that has been diluted at all.
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Old 16-08-2022, 10:04   #3
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Re: Potable water anti-freeze tester

Any refractometer that is set up for propylene glycol works (assuming you're using pg to winterize). I always test a fresh bottle of it to start, then flush enough through to get the same reading on what comes out. This way you use no more than necessary or risk using not enough
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Old 16-08-2022, 10:05   #4
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Re: Potable water anti-freeze tester

You might try google. "propylene glycol hydrometer readings"
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Old 16-08-2022, 10:08   #5
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Re: Potable water anti-freeze tester

Do you want to determine the freeze point for a given sample of water? The two ways that come to mind are by refractometer or hydrometer. Here is a refractometer example:

https://www.amazon.com/coolant-refra...+refractometer

To your second question it depends what you used as anti-freeze, because whatever you put into the water solution will affect its specific gravity but the freeze point might not be in lock step with that depending on the chemical. Here is a chart for propylene glycol:

https://pdf4pro.com/cdn/propylene-gl...vity-ac55d.pdf

Interpolating the chart suggests SG of 1.03 giving you about 34% solution by volume.
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Old 16-08-2022, 12:34   #6
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Re: Potable water anti-freeze tester

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Originally Posted by sesmith View Post
Any refractometer that is set up for propylene glycol works (assuming you're using pg to winterize). I always test a fresh bottle of it to start, then flush enough through to get the same reading on what comes out. This way you use no more than necessary or risk using not enough

That stuff isn't all PG and water. It's mostly cheap, watered down gin. Only 1% PG.


https://www.mehmerttiling.com/MSDS/R...20Pink_SDS.pdf


Curious how the MSDS lists the freezing point at +21 F, isn't it?
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Old 16-08-2022, 12:47   #7
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Re: Potable water anti-freeze tester

The -50F in the name seems... Borderline....
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Old 16-08-2022, 13:25   #8
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Re: Potable water anti-freeze tester

Winner of this year’s winterization post contest - August 16.
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Old 16-08-2022, 14:48   #9
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Re: Potable water anti-freeze tester

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Winner of this year’s winterization post contest - August 16.

To be fair, there are quite a few people in the northern states of the USA who believe that the sailing season ends on Labor Day and lay their boats up after that.
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Old 16-08-2022, 15:27   #10
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Re: Potable water anti-freeze tester

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Originally Posted by tcasey56 View Post
It can get expensive running anti-freeze until it runs pink or purple as water in the line dilutes it.
Seriously?

The -50 stuff is $3/gal and the -75 is $4.50/ - so less the $20/4 gal case.

If you're concerned about dilution, blow the lines out first. If you don't have a compressor? The discharge port on a shop vac should work. The vac also gives you a choice; instead of blowing it clear, you can suck the water out and the antifreeze in.

You're location is listed 'Annapolis'. You don't get that cold. So even with the dilution factor from residual water you will be fine, if you clear the lines first.
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Old 16-08-2022, 15:32   #11
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Re: Potable water anti-freeze tester

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To be fair, there are quite a few people in the northern states of the USA who believe that the sailing season ends on Labor Day and lay their boats up after that.
True that. We (our yc) start pulling boats the weekend after labor day (central Wisconsin/midwest USA).

Much to my chagrin, the club wants everybody out around mid October, so they can winterize the lift and 'put it to bed', even though the marina doesn't require us to be out until November 15th.
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Old 17-08-2022, 19:50   #12
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Re: Potable water anti-freeze tester

Some antifreezes freeze at a lower temp when they are mixed with the proper amount of water than when they are undiluted and pure. Just info
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Old 21-08-2022, 11:38   #13
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Re: Potable water anti-freeze tester

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Some antifreezes freeze at a lower temp when they are mixed with the proper amount of water than when they are undiluted and pure. Just info
Wait what? Can you please show me an example?
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Old 21-08-2022, 19:04   #14
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Re: Potable water anti-freeze tester

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Wait what? Can you please show me an example?
No, he can not.
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Old 22-08-2022, 06:08   #15
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Re: Potable water anti-freeze tester

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Originally Posted by thesaltytar View Post
Wait what? Can you please show me an example?
Here ya go. Google is your friend.

https://www.lentusllc.com/post/2019/...g%20conditions.
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