Purolite C100E Resin Polystyrenic Gel, Strong Acid Cation Resin, Sodium form, Potable Water Grade True Blue Dealer AFWFilters is a True Blue Dealer High quality resin Softening - Potable Water Food and beverage processing Compliant with FDA Regulation 21 CFR 173.25 for Food Treatment, Ion Exchangers Kosher Certified Certified by the WQA to NSF/ANSI-61 Standard 1 cubic foot 1 cubic foot is equal to 32,000 grains of capacity for a water softener. 32k system uses 1 cuft 48k system uses 1.5 cuft 64k system uses 2 cuft 80k system uses 2.5 cuft 96k system uses 3 cuft Purolite C100E Resin- Polystyrenic Gel, Strong Acid Cation Resin, Sodium form, Potable Water Grade Softening - Potable Water Food and beverage processing Softening - Industrial Efficient regeneration Good kinetic performance Low extractables Compliant with FDA Regulation 21 CFR 173.25 for Food Treatment, Ion Exchangers Kosher Certified Certified by the WQA to NSF/ANSI-61 Standard FUNNEL INCLUDED! ✓ ✓ ✓ For 32,000 grain systems ✓ ✓ For 48,000 grain systems ✓ ✓ For 64,000 grain systems ✓