Golfnut, Lassig offered you some sound information.
The Alum does not truly dissolve and will "fall" through the water column. You'll need to apply the slurry proportionately, adding more alum slurry over deeper waters than in shallow areas. The Hydrated lime will dissolve, but for best results, should be proportionately applied also to the alum.
I am 99.9% certain you will see virtually no change in clarity with only 50 pounds of alum per acre foot....I use a minimum of 200 pounds, and often much more before the floc begins. Alum applications for colloidal clay is pretty much an all or nothing proposition...You remove it all, or you accomplish almost nothing.
I always use at least 2 trash pumps. One to keep the slurries mixed, and one to pump the application hoses. The alum is quite acidic when wet, and the Hydrated lime is VERY caustic. Both slurries eat up metal parts in pumps, and the grit chew up seals and volutes/impellors fast...plan on trashing (or seriously reducing the pump volume) a trash pump during the application.
Last edited by Rainman; 08/06/15 08:23 AM.
