Dr. Don, Yes, I am talking about alum. If hydrated lime is needed. add the lime at one half the weight of the alum used. Contrary to popular belief, the alum does not disperse into the water. It dissolves but settles to the bottom, providing no real benefit other than keeping a small area from suspending. Read this link and it will explain why the clay suspends along with the need to mix a slurry and spray....
Langston Univ. I hope this helps. I wish I'd found this info before I wasted 600+ pounds of alum......
Ps. some studies say alum lasts to 15 years in a pond but adding more negatively charged clay from runoff can neutrilize the benefit rapidly.
