In a device for separating water and filtering impurities out of liquid hydrocarbons or fuels, comprising a housing including a first vertically arranged hollow body receiving the coalescer element and a second vertically arranged hollow body receiving a fine filter, and the first and second hollow bodies are joined to one another via a flow-routing component, both being oriented perpendicularly to the horizontally arranged flow-routing component which has a relatively large volume and a configuration for quieting the fuel flow to enhance collection of water droplets in a collection chamber formed at the bottom of at the bottom of the flow-routing component from where the collected water can be discharged.