Carwasher here. Thanks for the reply. I will look into soil flock. The dispersive clay that we have is a tough problem. This is what I have learned so far. The hydrated lime is worked into the soil and packed with a sheep roller. This allows you to use a dispersive clay soil to construct your pond and dam. Without it the clay will most likely fail at some point in the future. The NRCS has some good information on dispersive clay in bulletin 4-WI-49. My problem has been to find someone who has actually used hydrated lime for this purpose. Another thing that I have learned is that if you have a pond that stays muddy then there is an excellent chance the culprit is due to dispersive clay. The particles don't settle out they stay suspended and the pond remains muddy. Treating with gypsum clears the pond up but the possibility of a dam failure is still there if you don't treat the dispersive clay or bring in a suitable replacement clay to construct the dam.