Water purification device

A method for water purification, using a water purification device that includes a water collecting device having a surface defining a variable volume, wherein at least part of the surface of the water collecting device comprises a filter area, the filter area being permeable to water and allowing water to enter the water collecting device when the filter area is submerged in water,

• wherein the device further comprises an expansion device for exerting a force for increasing the volume of the water collecting device and thereby drawing water through the filter area into the water collecting device, the method comprising the steps of
• in the case that the water collecting device is not in a reduced volume configuration, compressing the water collecting device such that it is in the reduced volume configuration;
• submerging at least the filter area of the water collecting device in water;
• releasing the expansion device, allowing the water collecting device to expand, whereby water enters the water collecting device through the filter area;
• when a predetermined amount of filtered water has accumulated inside the water collecting device, removing the water collecting device from the water;
• draining the accumulated filtered water from the water collecting device.