theresa Posted April 21, 2011 Share Posted April 21, 2011 Just got my RO/DI setup. My pH is 9.8. This is not good? Shouldn't be around 8.4? Thanks Quote Link to comment Share on other sites More sharing options...
JamesL Posted April 21, 2011 Share Posted April 21, 2011 Hmm.., you measuring the pH before adding salt? I guess I have never done that, so I don't know what it should be Adding the salt should bring it to a correct pH though. Quote Link to comment Share on other sites More sharing options...
atxmandarin Posted April 21, 2011 Share Posted April 21, 2011 hmmmmm i dont think salt would lower the ph, you may want to test that again out of the RO and then again after mixing the salt, are you using a ph meter or liquid test kits? Quote Link to comment Share on other sites More sharing options...
theresa Posted April 21, 2011 Author Share Posted April 21, 2011 I am using a ph meter that is calibrated correctly. I will try both before and after salt is added and see what I come up with. Quote Link to comment Share on other sites More sharing options...
Mike M. Posted April 21, 2011 Share Posted April 21, 2011 If the TDS of your RO water is zero or near zero, pH of the filtered water is relatively unimportant. Mix the salt, bring it to 1.026 and check your pH. Due to the buffers in the salt mix, it will be near the 8.1-8.5 you'd like to see. Quote Link to comment Share on other sites More sharing options...
DaJMasta Posted April 21, 2011 Share Posted April 21, 2011 If the TDS of your RO water is zero or near zero, pH of the filtered water is relatively unimportant. Mix the salt, bring it to 1.026 and check your pH. Due to the buffers in the salt mix, it will be near the 8.1-8.5 you'd like to see. This (though I run 1.024 ). After some looking around online, RO/DI is neutral in pH (7), but because it is largely devoid of the ions used to measure pH, the meters don't necessarily read it correctly. Quote Link to comment Share on other sites More sharing options...
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