Make your pond picture-perfect with Outdoor Water Solutions Lake and Pond Bacteria Fall and Winter Blend. This highly concentrated blend of dry bacteria diminishes excess nutrients, reduces odor, and breaks down organic matter such as leaves, sticks, and muck to leave your pond looking healthier. The blend works down to 38F. It's divided into water-soluble pouches and packaged in a barley-straw base. It's environmentally friendly, which means it's safe for fish and plants. You can treat a 1/4-acre pond for a whole season with 12 lbs. of this expert blend. Works down to 38F Breaks down leaves, sticks, muck, and other organic matter Diminishes nutrient overload Reduces odor Divided into water-soluble pouches Packaged in a barley-straw base Environmentally friendly Safe for fish and plants Breaks down dead algae 12 lbs. is enough to treat a 1/4-acre pond for a whole season