Separation membrane, water treatment unit and water treatment apparatus

A water treatment unit usable in a water treatment apparatus that performs water treatment using a reverse osmosis membrane, comprising:

• a casing;
• a separation membrane mounted in said casing;
• and
• a cleaning device attached to said casing and capable of cleaning said separation membrane, wherein
• said separation membrane has a plurality of island-like portions and a plurality of fiber-like portions extending from said island-like portions and having a width smaller than that of said island-like portions, and an area of said fiber-like portions at a membrane surface is set to be larger than that of said island-like portions.

A water treatment apparatus that performs water treatment using a reverse osmosis membrane, comprising:

• a first water treatment unit capable of performing pretreatment of water to be treated;
• and
• a second water treatment unit capable of performing main treatment of the water to be treated,
• said first water treatment unit including:
• a casing;
• a separation membrane mounted in said casing;
• and
• a cleaning device attached to said casing and capable of cleaning said separation membrane, wherein
• said separation membrane includes a plurality of island-like portions and a plurality of fiber-like portions extending from said island-like portions and having a width smaller than that of said island-like portions, and an area of said fiber-like portions at a membrane surface is set to be larger than that of said island-like portions.