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Anonymous Poster

Distilled Water

01/10/2008 4:55 AM

how to check purity of distilled water used for batteries

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#1

Re: distill water

01/10/2008 5:14 AM

Hello Guest,

I assume your word: diatilled means: distilled.

If you are using water to top up lead-acid cells, there is are easy sources.

Ensure you collect and store water in glass, stainless steel containers, as it leaches out ions from metals.

Water which collects on the freezer plate in a domestic type of freezer, is as pure as you need.

You can also collect rainwater, but not in a thunderstorm, when it may be weak nitrous acid.

Snow is quite pure, providing you don't use the yellow variety

Melt the snow in Stainless steel pots or glass vessels.

You could try the boiling test, using a very accurate thermometer: http://www.fi.edu/guide/bond/purity.html

There are also small test instruments available, which are reasonably cheap, and give you a readout or printout on the water quality.

In most countries of the world, it does not matter if you use municipal water from the tap, to top up lead-acid car batteries, because they only last about 3-4 years maximum these days, and the thin plates and paste collapse before the minerals in domestic water supply are able to do any real damage.

Have a read above, and should you need further help....

Kind Regards....

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#2

Re: distill water

01/10/2008 5:32 AM

In an emergency (example: stuck in the middle of nowhere and having a low electrolyte level in the battery such that it cannot quite crank the engine) any water will do the job, though the battery's life will have been compromised.

Note that distilled water has virtually no resiliance to biological growth, and so it cannot be stored indefinitely. It needs to be used soon after it is made.

Distilled water will have a TDS level typically below 5ppm, which figure correlates roughly to 7-8μS/cm at 25degC on a hand-held conductivity meter. The lower the figures, the purer it is. No water can be purer than 18.8MΩCm (resistivity is the reciprocal of conductivity) at 25degC.

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