The following link is for the bucket test to determine how much alum to use.

http://srac.tamu.edu/tmppdfs/1152887-460...c876e2741425338

Can't add too much ag lime, we normally do 4-6 tons per acre but some have done up to 10 tons/acre. But quick or slacked lime can cause the pH to change rapidly when applied which can kill your fish. So it is not recommended to use quick or slacked lime.

You can't judge a fish by looking at the pond--Bo Diddley