The invention provides an apparatus having a tank having at least a portion of its surface collapsible such that the tank can be configured in either a deployed position or a smaller stored position. A membrane module is located in the tank. The tank has a feed inlet and a permeate port in communication with the membrane module. When in the deployed position, water enters the inlet and flows through the membrane and out the permeate port in a filtration process. When filtration is no longer required, the tank can be collapsed for transport. The membrane module may remain in the tank when the tank is collapsed.