Ro water ph still high details inside
I feel like you all would be more knowledgable on this subject. I just set up a tank (ten gallon) and filled it up with RO water; to my surprise the ph still measured to be 8 or above. I'm currently using an inert substrate, black diamond blasting sand, and it did have probably half a gallon of normal tap water in it. The ph of my tap is normally very high but I had expected the water to be at most 7. Any ideas?