... unusable-fish , no toxic residue 2,Cleaning pond with no pollution 3,Natural organic fertilizer Anhui ... It is a kind of residue of oil extract . Tea seed meal shows a brown granule ... ; killing snail , various wild fishes ,the unusable-fish,loach, spawns of frogs, tadpoles, earthworms, leech, ... shrimps; 3. Automatically decompose into efficient organic fertilizer to promote the growth of algae; 4. ...