Distilled water from the supermarket - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 05-31-2014, 02:16 PM Thread Starter
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Distilled water from the supermarket

Is distilled water ,the one we buy at the supermarket ,suitable for top-offs?
What is the difference between it and the one we obtain with RO units?

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post #2 of 7 (permalink) Old 05-31-2014, 02:34 PM
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The kind that has in small leters "distilled quality water" has minerals in it.
The one marked "Distilled water" has no minerals. Learned this many years ago when dating someone/w contact lenses. Seems the Distilled quality water will leave mineral stains on the lenses.
I will let someone who uses an RO unit tell you the difference in that one.

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post #3 of 7 (permalink) Old 05-31-2014, 04:08 PM
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at walmart they have water marked as "drinking water". the fine print tells you its Reverse Osmosis water. I use that.
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post #4 of 7 (permalink) Old 05-31-2014, 04:11 PM
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It's fine for top offs as long as it's pure distilled water.

The difference in properly distilled water and quality RO water is negligible, but distilled will generally win if there's any difference at all. It also depends on the quality of the distiller or filters in an RO system. Some distillers use copper parts; which could be bad, but I've never encountered an issue with it. Most distillers also use a secondary carbon filter to eliminate volatile gases for further purification. Distilled water from the store likely comes from nice industrial machines that take care of any contaminates that would concern us.

RO water is basically just as clean, but pathogens, minerals, etc. can escape if the filters aren't periodically changed, &/or if it's a weak RO unit to begin with. This is not likely to ever be a problem if all you want is clean aquarium water. We don't require nuclear grade water filtration after all .
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post #5 of 7 (permalink) Old 05-31-2014, 04:12 PM
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Quote:
Originally Posted by Raymond S. View Post
Learned this many years ago when dating someone/w contact lenses.
I busted out laughing when I read this
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post #6 of 7 (permalink) Old 05-31-2014, 04:17 PM Thread Starter
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Thanx guys.I should be fine ,since I only top-off a liter ,maybe 2 ,between my WC ,in my 10gal

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post #7 of 7 (permalink) Old 06-01-2014, 04:30 PM
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The difference between RO and Distilled is not important as far as aquarium keeping goes, unless there is a problem with the production. Such as suggested above: Copper tubing in the process, or microorganisms getting through, or not enough maintenance to the RO membrane.
A simple TDS meter will tell you if there is something wrong as far as salts or minerals in the water. With good RO or distilled water the TDS meter ought to read 0, it might read in the single digits and that is still good.
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