RO water PH is 6.4??? - Page 2 - The Planted Tank Forum
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post #16 of 18 (permalink) Old 05-06-2013, 03:05 AM
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RO/DI 6.4

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post #17 of 18 (permalink) Old 05-06-2013, 03:08 AM
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Originally Posted by somewhatshocked View Post
RO/DI water has nothing in it so there are no carbonates to buffer pH at a fixed point.

Your pH sounds normal.
Yup yup. This also means that atmospheric Co2 dissolving into your water causes the pH to be lower than 7.
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post #18 of 18 (permalink) Old 05-06-2013, 10:51 PM
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Originally Posted by xiaoxiy View Post
Yup yup. This also means that atmospheric Co2 dissolving into your water causes the pH to be lower than 7.

I was suspecting this, but not certain. I just remember reading that rainwater is typically ~5.5pH due to dissolved CO2
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