I just had a new pond built in all clay. The capacity is just over one acre foot. I would like to find a source of local bulk alum in NW Arkansas. The feed stores only have the little four pound bags. I would like to clear this pond before it is stocked. It hasn't filled at all yet so I have plenty of time, and I know it will be muddy until plants establish in a year or two. Any ideas on where to check?