Snipe, do another jar test on your pond water, but let it sit undisturbed for at least 5 days in a dark closet. You will likely discover the "green tint" is an algae and it will sink or float after dying in the dark. Alum will coagulate and sink the live algae. An algae bloom in your pond is a very good thing, as it is the base of your entire food chain. Visibility with a secchi disc should be 18-36 inches in a "health" bloom....less visibility could cause issues after several cloudy days by the algae dying off and the decay using up all oxygen and suffocating the fish.
