A method for processing a product by means of phase separation in at least two liquid phases in conjunction with additional clarification of solids, a. wherein the processing of the product occurs in a continuously operating centrifuge which is arranged as a separator, which comprises a rotatable drum with vertical rotational axis, in which a separator disk stack with risers is arranged, and is provided with a product feed tube and at least two separator elements (13, 16) for discharging a lighter and a heavier liquid phase from the drum and solid discharge openings for discharging a solid phase from the drum, with a separation zone being formed between the lighter and the heavier liquid phase (HP, LP) in the centrifuge, b. wherein the lighter liquid phase is discharged continuously and the heavier liquid phase and the solid phase are discharged discontinuously from the drum characterized in that c. for the discontinuous discharge of the heavier liquid phase the separation element is moved to different radii (Ri, Ra) for discharging the heavier phase, d. wherein the adjustable separation element is set in a first step i) to such a small radius, or will be set to such a small radius unless it has already been set to said inner radius, that its inlet opening will not immerse in the heavy liquid phase HP in operation, so that the heavier liquid phase will accumulate outside in the drum, with the radius up to which the heavier liquid phase reaches will rise in the drum from the outside to the inside, and that when the heavier liquid phase has risen up to an inner radius, e.g. when the heavier liquid phase has reached the inlet of the separator element, the inlet of the separator element will be set in a step ii) to a larger radius, so that the inlet will immerse in the heavier liquid phase, by means of which the heavier liquid phase will be discharged from the drum. a. wherein the processing of the product occurs in a continuously operating centrifuge which is arranged as a separator, which comprises a rotatable drum with vertical rotational axis, in which a separator disk stack with risers is arranged, and is provided with a product feed tube and at least two separator elements (13, 16) for discharging a lighter and a heavier liquid phase from the drum and solid discharge openings for discharging a solid phase from the drum, with a separation zone being formed between the lighter and the heavier liquid phase (HP, LP) in the centrifuge, b. wherein the lighter liquid phase is discharged continuously and the heavier liquid phase and the solid phase are discharged discontinuously from the drum characterized in that c. for the discontinuous discharge of the heavier liquid phase the separation element is moved to different radii (Ri, Ra) for discharging the heavier phase, d. wherein the adjustable separation element is set in a first step i) to such a small radius, or will be set to such a small radius unless it has already been set to said inner radius, that its inlet opening will not immerse in the heavy liquid phase HP in operation, so that the heavier liquid phase will accumulate outside in the drum, with the radius up to which the heavier liquid phase reaches will rise in the drum from the outside to the inside, and that when the heavier liquid phase has risen up to an inner radius, e.g. when the heavier liquid phase has reached the inlet of the separator element, the inlet of the separator element will be set in a step ii) to a larger radius, so that the inlet will immerse in the heavier liquid phase, by means of which the heavier liquid phase will be discharged from the drum.