for Laboratory Ultra Pure Water The AmeriWater Silex deionizer is the simple solution for small to mid-size high quality hospital applications. Also available in a smaller wall hung style, this resin pack exchange system makes it simple to maintain pure water at a fraction of the cost of similar cartridge style systems. When the quality light or monitor indicates the resin pack is close to exhaustion, simply remove the exhausted pack and slide in a new pack. Ship the exhausted pack to AmeriWater (UPS/FedEx) along with a regeneration certificate. Within 24 hours of receipt, a fresh pack will be shipped back to you.