bobad,
Thanks for explaining but does it not bind to clay particles lying on the pond bottom? The reason we apply ag lime across the whole entire pond to get it to fall on as much bottom clay as possible to then change soil chemistry so then water chemistry is improved. I know for a fact applying lime in only a few places in the pond does little to help the water vs. applying properly. I'm still not convinced alum is not needed to be diluuted in the water column to capture suspended clay either slow or fast.

Is it possible for the alum to bind to bottom clay or simply not have enough charge to be "pulled" into the water to bind with suspended clay????

And again I'm back to the PH part of adding alum if acting slowly if you will how do you balance the pH with hydrated lime? Thanks for your time.

Greg Grimes
www.lakework.com