High pH out of tap, decreases with time - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 08-18-2016, 11:31 PM Thread Starter
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High pH out of tap, decreases with time

My water right out of the tap is a deep shade of purple on the API high range pH test, meaning it's somewhere between 8.4-8.8. I filled a bucket of water this morning, and ~8 hours later, it's now around 8.0-8.2. I have a bucket that's been sitting out for a few days, and it's settled down to 7.0-7.2.

I was wondering what could be causing this? I know that sometimes, tap water contains CO2 which lowers pH, causing it to rise once you let it sit for a day, but what causes the reverse of that? I don't have access to a KH, GH, or TDS test currently.
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post #2 of 6 (permalink) Old 08-19-2016, 01:00 AM
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From what I understand the chlorine/chloramine can affect pH test so maybe once it gases off you see the change in pH . Just a thought .

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post #3 of 6 (permalink) Old 08-20-2016, 03:35 AM Thread Starter
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Interesting, I've been dosing prime immediately though, and it doesn't seem to affect the high pH. Unless however it works to remove chlorine/chloramine change its effect on pH.
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post #4 of 6 (permalink) Old 08-20-2016, 04:35 AM
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Water companies add something to the water to raise the pH, so the water can't erode the copper or lead parts of the plumbing. That stuff chemically changes with time, allowing the pH to drop when the water sits out in the air for some time. I think lye is one of the things they use for that purpose.

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post #5 of 6 (permalink) Old 08-20-2016, 08:13 AM
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@Hoppy is right on the money ... again.
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post #6 of 6 (permalink) Old 08-21-2016, 07:59 PM Thread Starter
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Thank you, that makes sense. Whatever they add doesn't seem to bother my fish so that's good. I'll just make sure to always have a couple 5g buckets filled and dechlorinated in case I need to do emergency water changes so I don't cause big pH swings.
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