DKFarms, I've never cleared a pond with less than 50 lbs of alum per acre foot. You'll have a maybe a slight residual amount, but I assure you some flocculation occured and the alum is now on the ponds bottom locked up.

I would suggest 400 pounds alum and 200 lbs Hydrated lime. Trying to "Partially" clear the pond is not a good idea as you want to establish water that is positively charge rather than neutral or new particles entering will easily suspend again.

Remember to spray amounts in relation to depth, ie 50 gallons over 10 foot depth versus 5 gallons over 1 foot depth.

Last edited by Rainman; 05/16/09 01:21 AM.