Liquid Treatment Device, Method of Manufacturing It and Liquid Treatment System

A liquid treatment device including a body, the body including:

• a container section defining a container for holding liquid to be treated and
• a liquid treatment section defining a cavity and including at least one liquid treatment part, wherein the body includes
• at least one liquid-impermeable wall defining at least a bottom of the container and
• at least one wall enclosing the cavity,
• wherein these walls of the body are inseparable, any seams in transitions between these walls being between parts of the body joined by bonding, and
• wherein the liquid treatment device is provided with at least one first liquid-permeable window allowing liquid to egress from the device and at least one second liquid-permeable window allowing liquid to flow from an interior of the container to the cavity,
• wherein the liquid treatment device includes a barrier between the cavity and the container interior, the barrier including at least one of the second windows,
• wherein the barrier is inseparable from the body.