I'd go with the Alum and add lime if it's needed.
The down side with turbid water is if you had fish that depend on sight to find their food, they will have a hard time and growth will probably be slower than normal. The upside is not much worry about weeds or filamentous algae getting out of control and your PH will be stable during a 24 hour cycle.
OTOH I don't know about you but I don't find turbid water aesthetically pleasing.
Why do you have dead grass along the shoreline?
Last edited by Cecil Baird1; 05/20/14 03:05 PM.
