Operational process for a dishwashing machine

An operational process for a dishwashing machine having at least one of a washing phase and a rinse phase, said machine including a program sequence control apparatus (14) for controlling the phases;

• a collecting sump (5);
• spraying means (8,13);
• a circulation pump (7) supplying the spraying means;
• and a suction mouth (11) of the pump, a top portion of the mouth being arranged at a pre-determined level (H) in the sump, said process comprising the steps of inletting water into the collecting sump (5) up to a static level (L);
• and spraying water onto a washload by said spraying means in an intermittent manner with an alternating sequence of spraying periods (T) and pauses (Tp) during which pressure of the water downstream of the pump (7) is at a highest value (P1) and a lowest value (P), respectively, characterized in that each one of said spraying periods (T) has a duration that is substantially equal to a time taken by the water in the sump (5), due to its being drawn in by the pump (7) and delivered by said spraying means (8, 13), to fall from said static level (L) down to said pre-determined level (H) of the pump suction mouth (11).