Mobile Spot Free Replacement Resin for units MSL0918-0.5-MB6040-C-0 and MSL0918-0.5-MB6040-C-1. The Mobile Spotless Rinse system takes  0.5 cubic feet / 22 pounds / 9.98 kilograms are in this bag of Mixed Bed Resin The Resin is designed to treat potable water to 500,000 ohms or better quality of spotless water. Specifications for this product are included in the picture section of this listing.