Lasciare reagire per 10 minuti. Riempire d’acqua la provetta, lasciare decantare il sedimento per 2-3 minuti ed eliminare con cautela l’acqua e le particelle in sospensione,
The reaction shall be allowed to continue for 10 min. The tube shall be filled with water, the sediment shall be let settle 2-3 min, and the water and the suspended particles shall be poured off gently.