A pilot-scale experimental high-rate algal pond (HRAP) was investigated in the subarctic mid-Sweden region, at latitude 63uN. During autumn 2002, conditions included temperatures below 10uC and photosynthetic active radiation below 200 mE/m 2 ?s. Biochemical oxygen demand was reduced by approximately 90% (approximately 40 g/m 3 ), chemical oxygen demand by 65% (approximately 80 g/m 3 ), total phosphorus by 20% (approximately 1 g/m 3 ), and total nitrogen by 46% (approximately 15 g/m 3 ), at a retention time of approximately 2.5 days. During autumn 2003, the performance of the HRAP appeared better with a more dense microalgae culture; however, as a result of poor settling of the microalgae, the reduction was considerably lower. A major difference between the years was the microalgae composition. In 2002, the large green algae Coelastrum dominated with Chlamydomonas, Scenedesmus, Lagerheimia, and the Cryptophyte Rhodomonas. In 2003, there was a total dominance of the very small green algae Chlorella, known to be difficult to settle. In batch growth experiments during spring 2002, doubling times of 4 to 6 days were achieved. The period of temperatures above 10uC and an insolation of more than approximately 270 uE/m 2 ?s (125 Langleys), which is well-documented as appropriate for HRAP function (Oswald, 1988a(Oswald, , 1988c, were measured to last for 4 to 4.5 months from early May to late September. However, the growth and treatment performance experiments indicated that a longer season may be possible-6.5 to 7 months, at best-from early April to late October. Water Environ. Res., 82, 830 (2010).