Water-filtration device

A water-filtration device comprising:

• a filter head having
• a water inlet;
• a water outlet;
• a water filter detachably mounted at a bottom of the filter head, and having
• a filter housing;
• a first filtrating room disposed inside the filter housing;
• a second filtrating room disposed inside the filter housing and under the first filtrating room, and connected to the first filtrating room;
• a connecting tube mounted through the first filtrating room and the second filtrating room, and a bottom of the connecting tube connected to the second filtrating room;
• wherein each of the first filtrating room and the second filtrating room contains one filter material;
• a guiding assembly mounted at the filter head and disposed inside the water filter, and comprising
• a first guiding portion connected to the water inlet;
• a second guiding portion connected to the water outlet;
• a bypassing portion having
• a cooperating end connected to the connecting tube, and having
• a cooperating recess tapered inward;
• a connecting end opposite to the cooperating end, and connected to the first filtrating room;
• wherein the guiding assembly is connected to and cooperates with an inner side of the water filter to form
• a main-filtration path connected to the water inlet and the water outlet;
• and
• a bypassing-filtration path connected to the water inlet and the water outlet and passing through the bypassing portion;
• and
• an adjusting valve movably mounted at the filter head, and comprising
• an adjusting bar having
• a conical tip tapered toward an end of the adjusting bar and capable of reaching into the cooperating recess of the bypassing portion;
• an O-ring adjacent to the conical tip and at a side of the conical tip that is away from the said end of the adjusting bar;
• wherein the adjusting valve is operable to make the O-ring contact or move away from the cooperating recess of the bypassing portion, thereby closing or opening the bypassing-filtration path.