Plain old grocery store baking soda is the stuff. You say your pH is too
high, and buffering (KH) is low. The baking soda will bring the pH toward
8.4 from higher or lower. If the pH is at or near 8.4 then you can add a
pound at a time and see when the KH gets to about 7 dgrees or 100 ppm, which
is a good level. Up to 300 ppm is acceptable. If the pH is drastically
different than the 8.4, add just a small amount per day, raising or lowering
the pH no more than 0.2 per day.
--
RichToyBox
http://www.geocities.com/richtoybox/pondintro.html
Webwarlock wrote in message
...

OK, so I got a pond kit to test my bond.
I read it as the ph level was too high and the total buffering
capacity was too low. According to the instructions I have to add
Sodium Bicarbonate (baking soda) to bring it up.

My question is, is the standard baking soda in the grocery store ok to
use as long as I just get pure baking soda? If so how much should I
add?
My pond is about 2000 gallons.

Thanks for the info.