Pond Boss Forums GENERAL QUESTIONS Muddy water Alum kicks clay's butt....again!!!

I have a small pond (1 acre/ft) that I am treating with Aluminum Sulfate to clear the water. I put in 150 lbs but still only have 2 feet of visibility.I have high pH (7.8) so I didn't use any hydrated lime. Is the lime required to make the chemical reaction happen?