ELGA systems meet all your ultra-pure water needs: Systems are offered which produce ultra-pure water from either pre-purified or potable sources: Pre-purified Feedwater - The PURELAB Ultra, the state-of-the-art ultra-pure water polishing system, with five models for the most critical bioscience and analytical applications where large volumes are needed. - The PURELAB UHQ PS for low volume usage. - The PURELAB Classic, the best option for budget minded laboratories needing top quality water produced form a pre-purified source without the enhanced features of the above. Potable Feedwater - The PURELAB UHQ II for low volume usage. - The PURELAB Option-Q for the production of up to 50 liters per hour of ultra-pure water.