in an aquarium it kills the biofilter and the nitrites which are acid
plus the organic debris which is acid drive the pH down. I would
imagine in a pond the same thing would happen, altho if there is just
high ammonia, that would drive the pH up.

I have never let my ponds get to sewage stage yet. Ingrid

On Tue, 3 Jul 2007 07:17:47 CST, Phyllis and Jim
wrote:
Does the sludge and rotting stuff push the pH down or up? I thought
it would move things in the acid direction.