QED is the industry leader and pioneer of the low flow MicroPurge groundwater monitoring method. Low Flow Sampling has been developed over the past 25 years and offers numerous benefits over older, less efficient and less accurate methods. QED's line of equipment includes: dedicated sampling pumps (Well Wizard), portable sampling pumps (Sample Pro), controllers, flow cells, power supplies, level meters and filters. MLEE and QED stock a full line of filters, tubing and spare parts, available for next day shipping.