Personally, I'd rather use aluminum sulfate and hydrated lime to change the ionic balance in the pond water than put topsoil into the pond. The potential excess nutrient problems associated with the topsoil is what I'd try to avoid.
I am finding alot of information on using ag lime to help with the water clarity on an existing pond. But nothing on a freshly built pond that is dry.
Would it be a good idea to apply the ag lime to the bottom of the pond now? And how much per acre should I be using at a minimum?
I have read that you really can't over do it. I have 4 acres of pond and one dump truck will get me about 15 tons for around $200 delivered.
