PH changes when mixing tap+RO - The Planted Tank Forum
 
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post #1 of 2 (permalink) Old 10-23-2018, 04:39 PM Thread Starter
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PH changes when mixing tap+RO

Hello,

I wonder if it's normal, or maybe I'm testing it wrong, basically here's what happens:

TAP water PH is above 7.6 maybe close to 8 (my test shows max 7.6 and it's not enough)
RO PH is 6.4
If I mix 20% TAP + 80% RO I'm still getting above 7.6 PH... judging by the color maybe close to 8.

Can my TAP water really be that awful?

I hope to arrive to my death late, in love, and a little drunk.
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post #2 of 2 (permalink) Old 10-23-2018, 08:50 PM
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Adding RO water to tap water will not change pH, it will lower KH which will make the water less resistant to lower pH. After you mix it, smaller amount of acid will move pH lower than before.


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