Round Filter Element of a Filter for Urea-Water Solution and Filter

A filter for a urea-water solution, the filter comprising:

• a filter housing comprising at least one inlet for the urea-water solution to be purified, at least one outlet for the urea-water solution that has been purified, an installation opening, and an openable housing cover closing off the installation opening;
• a round filter element configured to be insertable through the installation opening and arranged such inside the filter housing that the round filter element separates the at least one inlet from the at least one outlet, wherein the round filter element comprises:
• a filter bellows comprising at least one filter medium that continuously extends circumferentially, relative to a filter element axis, around an element interior of the round filter element, wherein the element interior forms at least partially a filtration volume of the filter;
• at least one end body fastened to an end face of the filter bellows, wherein the at least one end body comprises at least one connecting section configured to fasten the round filter element to the housing cover of the filter housing;
• at least one volume compensation device comprising at least one flexible separation section configured to separate a compensation volume from the filtration volume of the filter.