The weight filling technology is based mainly on gravity or assisted by a light overpressure for highly viscous products. The sauce is not strongly forced into the filling unit, as is the case with volumetric filling where the product suffers a double intake and down stroke to get in and out of the dosing chamber, or with flow metering where it has to be pressurized to pass through a flow meter and the narrow tubes. To the contrary, weight filling uses a gravimetric tank, where the product load is maintained at a constant level, ensuring a linear and regular flow which reduces viscosity loss.