Randy Holmes-Farley
Reef Chemist
View BadgesStaff member
Super Moderator
Excellence Award
Expert Contributor
Article Contributor
R2R Research
My Tank Thread
- Joined
- Sep 5, 2014
- Messages
- 67,311
- Reaction score
- 63,661
The pH of RO/DI top off water is essentially irrelevant and is not accurately measured anyway.Also, my wife just mentioned the pH of the ATO water. It's in a loosely sealed container, and being RO, seems likely to absorb anything, including CO2. I've never checked, but dumping in a litre a day of low pH water can't be helping anything. I assume it's 7, but should test to be sure.
even more oddly, adding totally pure fresh water at pH 7 to pH 8.2 seawater will give a pH above 8.2. Gotta love chemistry!!!