Correcting pond water for high and low pH values

Pondkeeper's How to...

Correcting pond water for high and low pH

Testing garden pond water, correcting pH

To correct pH problems in a pond use dilute solutions of vinegar, or lemon juice for high pH readings and baking powder for low pH readings.
Make sure you do not add too much at once. The procedure is add some, wait, test again.

It is important to always test at the same time every day since the natural pond cycle creates pH changes at different times of day. For example as carbon dioxide is released by plants the pH may well decrease, When the plants absorb carbon dioxide the pH could rise again. About 10am is a good time to test.

Testing pond water. This is straight forward and is done by using special kits. Look out for expiry dates since chemicals used for testing are sensitive to time. Do not get carried away with the test results. After all they are indications only. The good reason for testing is to check stability or consistency and not absolute values. If your fish and plants are thriving and your pH for example is consistently on high side .......... so what? When you see a definite change in fish behaniour then start testing.