Diffusiophoretic water filtration device, membrane, output splitter and inlet manifold and related methods

A water filtration device comprising:

• a diffusiophoretic water filter having a plurality of side-by-side channels and having an inlet and an outlet and for receiving a colloidal suspension at the inlet and flowing the colloidal suspension between the inlet and the outlet in a flow direction through the plurality of side-by-side channels, the plurality of side-by-side channels being in contact with a diffusiophoretic-inducing membrane on a first side and a gas-permeable cover on a second side facing the first side, the membrane and the cover being spaced apart by two end walls and a plurality of side walls between the two end walls, the side and end walls extending in the flow direction and having a height defining a thickness of the channels;
• and
• a weight contacting the cover and pressing the cover against the plurality of side walls between the two end walls so as to fix the cover with respect to the membrane at the plurality of side walls, the weight being gas-permeable so as to allow gas to pass from the channels through the cover and the weight.