Justified, my guess, since I've not seen your pond, is it is closer to your 1/3 acre size, with a deeper average depth. 200 pounds applied pretty evenly/proportionally will clear one acre foot of water, and stirred sediments will normally settle in seconds to a few minutes (if water is left undisturbed again). Kids swimming could cloud up a small pond and keep it stirred for a while, but with the proper "dose" of alum, it would have cleared within minutes of the kids getting out.

Last edited by Rainman; 05/08/17 10:27 PM.