Help = buffering agents for pond pH ?
I have been trying to understand many writings online and in a couple of books I have about pH swings - and what I keep reading is that there are natural buffering agents.
What I don't understand is do these "agents" work at both ends of the scale of pH. I've been getting readings fairly consistently of 7.4 about 9am and about 9.0 at 6:30 pm. From what I'm reading it is better to have the upward pH around mid-8. I've read posts here and many other sources online and finding a lot of conflicting information. For instance that lime-leeching from concrete blocks or grout - is bad. But I also have read that it is a good buffering agent - keeping the pH from fluctuating the extremes. I'm all for finding a natural persistent balance - and not quick fixes.
I am certainly not a chemist - and find the information I'm reading is complicated and contradictory. Is lime leaking cement blocks helpful or not ?
How do hydrogen ions play a part ? Algae ? Oxygen ? My expanded pond is 1 and 1/2 months old. So I don't want to do anything drastic. But this pH swing concerns me.
Am I over-reacting ?
with thanks for your help !!