Drainage passage including filter and washing machine having the same

A washing machine comprising:

• a main body;
• a tub, arrangeable inside the main body, and configured to receive water;
• a drainage pump configured so that the water received inside the tub flows to an outside of the main body through a drainage passage;
• a first filter, arrangeable along the drainage passage, and configured to filter out foreign matter equal to or greater than a predetermined size from the water which flows through drainage passage;
• and
• a second filter, arrangeable along the drainage passage, and configured to filter out foreign matter smaller than the predetermined size from the water which flows through drainage passage,
• wherein the drainage passage includes:
• a first connecting hose, connectable to the tub and an inlet of the first filter, to guide the water to flow from the tub to the first filter,
• a second connecting hose, connectable to an outlet of the first filter which is positioned lower than an inlet of the second filter, to guide the water to flow from the outlet of the first filter toward the inlet of the second filter and guide the water to flow to the outside of the main body without passing through the second filter, and
• a drainage hose, connectable to an outlet of the second filter, to guide the water to flow from the second filter to the outside of the main body and guide the water to flow to the outside of the main body without passing through the second filter.