A process and apparatus for periodically dumping liquids in an installation,
in
which liquids are recycled or otherwise accumulate dissolved and/or suspended contaminants,
which process and apparatus makes use of a container for a liquid which is alternately
filled and drained during operation of the installation, resulting in changing
weight or buoyancy of the container or level of a float in the container, which
actuates a dumping valve when a given critical weight, buoyancy or float level
is exceeded or reduced.