dkfarms. It sounds like you got some phytoplankton forming with the greensih color; that is good. Not sure about what bobad means but alum piled up is very insufficeint the more you have in solution the better you have a chacne to "grab" suspended charged particle and floc it out. Makes me nervous you might have a fish kill later if some left around on pond bottom.

Greg Grimes
www.lakework.com