Vortex impeller submersible pumps made of stainless steel AISI 304, suitable to lift slightly dirty waters without sand containing organic solid and to empy cesspits. The particular shape of the impeller allows the passage of solid materials up to 30 mms diameter and to empty second purification cesspits. Head: up to 8,5 m. Delivery: up to 250 l/min (15 m3/h). Not suitable for washing mashines waters or liquids containing soaps/detergents.