In order to maintain your knife at its best and sharpest condition, "iiza" recommends the use of a whetstone for your HÔTCHO".
Generally whetstones are classed into 3 categories; Rough, Medium, and Fine stone.
If you can see a white line on the blade edge or it becomes obvious the sharpness has diminished then is time to sharpen your knife.
One of the main reasons for sharpness in a knife, is the correct angle of the blade edge.
Please keep the surface of your stone flat by rubbing with leveling stone, or something hard, e.g. wall or pavement.
Please remember any product warranty will no longer be valid if the angle of your blade edge becomes excessive, damage caused by misuse or warranty period has expired.
If you have any questions, please contact your store of purchase or contact us directly.