Apr 18, 2002, 12:03 PM
Post #23 of 35
Hi Dr Tan, Mark and the rest!
No hard feelings on my side. I am still learning everyday from all of you.
Maybe I should clarify what I have said in my earlier message: I am suggesting that comparing leaching the pond with acid or pineapple skin to reduce the pH, I prefer using Baking soda. This is in the context of those who have started putting fishes into the pond and not for new ponds. For new ponds, acid or pineapple skin is OK because there are no fishes yet!
But once there are already fishes, the owner may need to remove the fishes from the pond if acid is used. So to prevent this hassle, I have suggested baking soda which will definitely bring the pH down from 9 to 8.4.
To answer Dr Tan's question, "How to bring it further down to 7.4-7.6?", well from what I understand, over a period of time, the pH will slowly drop as the carbonates in the water is used up and it will balanced itself, unless the pH in your tap water is unusually high to begin with. Most concrete ponds will initially register high pH because of the limestone. But as long as your pH is not above 9.5-10, then one should not be overly concerned because as the pond matures and as the carbonates are used up, the pH will naturally drop.
That is the reason why most ponders are more concerned about pH crashes than high pH! So we use oyster shells, cockles, coral chips, baking soda etc. to buffer the pH of the water. As I have said earlier, once you manage to get your pH reduced to 8.4 using baking soda, it will stay that way and then later on, the pH will start to fall. What is more important is to keep your KH above 120 at any time. I hope what I have said make sense! Comments welcomed.