The recomended rate is 40lbs/acre which is what we have used on a couple of our test plots. The depth shouldn't matter since it sinks to the bottom. We applied it in both a shallow pond and a deeper pond. Its effects can be active for up to 4 months depending on BOD. This is what we have been told which is why we are conducting our own tests. So far so good, but we are only 2 months into it. Since it is only effective for a few months, I don't think it is an alternative for year - round aeration especially in ponds much larger than an acre or two. I would recomend its use for winter aeration - apply before the pond freezes and it should provide oxygen through out the winter. Another case would be shallow water applications were bottom diffusers are inefficient (under 4') or where cold water fish species are a concern.
As far as the PH question is concerned I am unsure how the PH effects the solubility, but I will find out.
