ALL-NATURAL: Revive and maintain any size pond with Hello Ponds All Season Liquid Bacteria. 1 ounce will treat up to 1,000 gallons of water and 1 quart will treat a 1/4 surface acre in medium to large ponds! EFFECTIVE: Clears up water, reduces dirty water & odors, sludge, fish waste and breaks down & helps get rid of dead algae, leaves and grass clippings. VERSATILE: Specially formulated for large ponds as well as smaller bodies of water such as decorative ponds & water gardens. Reduce sludge & buildup. Eliminate pond odors. Improve water clarity. Reduce oxygen demand. Eliminate excess nutrients. Ideal for ponds of all sizes . Can be used year round in any temperature.