This report describes filters for washing machines designed to remove either microplastic fibres or lint from laundry water and investigates possibilities and challenges with such filters from a practical and environmental perspective. The report includes results from a literature study and a laboratory study. Other studies on microplastics from laundry water are summarized briefly. It can be concluded that filtering solutions for washing machines which claim to remove lint and microplastic fibres can be purchased and installed. Three of the filtering solutions were tested in laboratory washing trials and were found to retain some of the microplastic, hence decreasing the amount of microplastic released with the laundry water. The retention was most profound the first time the new fabric was washed. To judge exactly how well the filters remove microplastics during realistic domestic washing conditions would require more comprehensive laboratory work. It is also necessary to further investigate how efficient the filters should be to present an alternative that is technologically, economically feasible as well as environmentally beneficial. Although the filters may retain microplastic fibres it may be necessary to design filtering solutions that are sufficiently user-friendly so that the filters are not by-passed by the user, and that there are good options for emptying or replacing the filters.