PURELAB Prima The PURELAB Prima range from ELGA produces primary grade purified water from a potable source in a wide range of volumes for laboratory, medical and industrial applications. Using proven reverse osmosis (RO) technology, the PURELAB Prima is ideal for feeding ultra-pure water systems and for typical laboratory applications including glassware washing, a feed to autoclaves, and for use in environmental cabinets. PURELAB Prima systems are compact in size and are available in a choice of flow rates to meet your specific needs. The smaller models provide flow rates of 7, 15 or 20 liters per hour whilst the larger models deliver 30, 60, 90 or 120 liters per hour.