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Originally Posted by mark
When I was using store bought ro/di, I would aerate for a day before using to top off or adding salt because of the pH. Aerating a day would bring back to neutral.
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I agree whole heartedly, AERATE, AERATE, AERATE.
Found out the hard way, when first setting up my tank.
PH= 7.3 with Instant Ocean salt mix. I thought it was a bad batch(or so I was told) but mixed it with powerhead only.
I proceeded to make a test batch to check if it was bad, but this time I used a powerhead and an air pump/stone and the PH=8.3.
From talking to others, it has something to do with carbon dioxide been released to bring the chemistry of the water in check.
I'm in no way an expert, just what I was told. 
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Mike
90 gal. FOWLR, 25 gal. Sump/Refugium with Chaeto Macro, 60lbs. Live Rock, Q.O. 6000 Return Pump, Wavysea Wavemaker, Aqua C Urchin Skimmer, 2-VHO (1-super actinic blue, 1- actinic white), Icecap 660 Ballast, Auto Top Off System, 2 Clownfish, 1 Brittle Star, 20 Hermit Crabs, 7 Small Mushroom Frags (attempting a mixed reef).
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