>We do not understand pH.
Here's one introduction
All ponders really need to know is pH is a number the test kit gives,
that pH may be unstable so should be tested in early morning and
midafternoon, and pH is really just a symptom of KH (alkalinity).
So if the pH is outside the desired range, or is unstable, look at KH
for the cause.
>Please expalin the acid, base relationship and how the pond thrives
>acording to this important balance.. There are many who require this in
>very understandable terrms.
The USDA has published a very practical, 4-page "Interactions of pH,
Carbon Dioxide, Alkalinity and Hardness in Fish Ponds"
It's worth printing out as a handy reference.
>I have used baking soda to reg. my alk. pond water. My well water is alk. I
>was reading about using oyster shells and how they self reg.
Baking soda will dissolve at any pH.
Calcium carbonate won't dissolve and is of no benefit if the pH is 8 or above.
If your pond is so "alk" that pH > 8, it won't help.
>What is the best pH for ponds. ?
7.5 to 8.5.
Below pH 7.5, either CO2 is too high for fish, or KH is too low to keep
the pH stable. Below pH 7, both are true.
Above pH 8.5, ammonia toxicity is of greater concern, and certain nutrients
become less available to plants so they don't do as well. Above pH 9,
both problems become serious.