Knives with a smooth edge are sharpened in two phases. For rough sharpening, tilt the tip of the knife downwards and pull it through the grinding bars about two to three times under light pressure. In the second phase, fine sharpening, tilt the tip of the knife upwards and pull it through the grinding bars several times until the desired sharpness is achieved.

Knives with a serrated edge should be pulled horizontally through the sharpening rods without tilting the knife. It is important to exert slight lateral pressure in the direction of the serrated edge. This process should be repeated until the desired sharpness is achieved, typically two to four times depending on the condition of the blade. After sharpening, tiny metal shavings may remain on the knife blade and should be rinsed off.

The knife sharpener itself is easy to clean due to its simple design and sturdy construction. The metal shavings can be wiped off with a damp cloth. The Vulkanus Professional is also dishwasher safe, allowing for convenient cleaning.

This knife sharpener can be used for both smooth and serrated edges at a wide range of sharpening angles. With the Vulkanus Generation 2, the performance of this proven sharpener has been further optimized. The material and shape of the sharpening inserts have been reworked, increasing their service life threefold and refining the sharpening result. The sharpening angle has been extended to a range of 11° to 21°. A widened sharpening shaft at the top makes it easier to apply the knives. The bar springs are now concealed in the new generation, and their pressure force has been significantly increased. Additionally, the sharpening elements are much easier to replace if necessary. The sharpener features a stainless steel housing.