I have a new pond in Mauriceville TX, it was muddy for 2 months then i started adding Gypsum. Every two weeks I checked it and added about 5 more bags. It took about a month, but now it looks like a blue lagoon. If I get heavy rain it cloudies up again, but eventually settles out. I have the same problem you have no vegetation and all the mud/silt empties into the pond. Try planting winter rye along the banks and Gypsum.


TWL