Device for filtering

A device for filtering a liquid, comprising:

• a container (110) for holding the liquid (10), wherein the liquid (10) contains at least one solid substance (10a) and is formed with a first fastening part (110a);
• a filter unit (120) axially slidable in the container (110) and formed with a second fastening part (120a) matching with the first fastening part (110a), wherein at least a portion of an outer side surface (120b) of the filter unit (120) frictionally axially slides over an inner side surface (110b) of the container (110) and forms an air-tight seal with the inner side surface (110b) of the container (110), when the filter unit (120) is slid in the container (110);
• and
• a filtering medium (130) non-permeable to the solid substance (10a) in the liquid (10), wherein the filtering medium (130) is provided at a bottom end of the filter unit (120), such that when the filtering medium (130) is being urged into the container (110), the liquid (10) passes through the filtering medium (130) and enters the filter unit (120), while the solid substance (10a) is retained in the container (110),
• characterized in that the fastening parts (110a, 110b) are configured as screw threads capable of locking the filter unit (120) at different depths with respect to the container (110) and capable of converting rotational motion/force into linear motion/force such that a screwing action of the first and second fastening parts with respect to one another urges the filter unit (120) into the container (110) in a controlled manner such that pressure required for filtering the liquid is exerted by the screwing action.