No added 70 µm polystyrene beads were detected after filtration in a test on three units. Each unit was conditioned with 50 litres of deionised water before a one-litre sample containing 1,000 beads was filtered. Results apply to this test and do not establish removal of every microplastic size or polymer (Measurlabs, report 15010, 12 February 2025).

In a laboratory test on three filter units, 13 of 14 tested substances were reduced below the laboratory’s quantification limit of 0.010 µg/L. Initial concentrations were 0.043–0.057 µg/L. Benzotriazole was not consistently reduced. Results apply to the tested samples and conditions (Measurlabs, report 15544, 5 December 2024).