• 4 PK/8 OZ • 4 throw packs treat 1 surface acre 4 to 6 feet deep. Apply monthly for 90 days then every other month until muck is gone. • Natural muck and sludge removal in water with heavy organic debris loads. Features biostart complex. • Highly concentrated probiotic formula enhances natural bacteria to aid in decomposition of sludeg and bottom muck. • Treats all year long with cold or warm water strains. • Provides starter food for spores upon entry to water. • 100% safe for fish, waterfowl, livestock, pets, & swimming immediately after treatment.