***0.5cuft foot bag will be repackaged due to the resin not being manufactured in 0.5cuft bags. Resin is separated from the 1cuft bags to make 0.5cuft bags*** 1.5 cuft of Purolite C100E resin (for 48k systems). Purolite C100E is a premium, industrial grade gel polystyrenic strong acid cation exchange resin supplied in the sodium form. Its principal application in the sodium form is in industrial water softening.Purolite Standard Purolite Standard Resin is a high purity premium grade bead form conventional gel polystyrene sulfonate cation exchange resin designed expressly for the treatment of foodstuffs, beverages, potable waters, and water used in the processing of food. Its specification is such that it will exceed the relevant EEC requirements, and the resin is in compliance with the U.S. Food Drug Administration Code of Federal Regulations section 21, paragraph 173.25; for use in the treatment of foods for human consumption. Its high bead integrity, excellent chemical and physical stability, and very low extractables content play a large part in its successful employment in these areas. Basic Features: Application - Domestic/Industrial/Food grade softening - supplied in Na+ form - Potable Use Polymer Structure - Gel polystyrene crosslinked with DVB Appearance - Amber, clear spherical beads