*A4000 is tested and certified by WQA against NSF/ANSI Standard 61

Resin Properties 
Type: 8% crosslink polystyrene
Form: Gel- type, light amber bead
Ionic form: Na+ (as shipped)
Functional group: Sulphonic acid
Bead size: 16 x 50 mesh
Effective size: 0.45 ± 0.07 mm
Bulk density: ~ 51 lb/ft 3
Bead count: min. 90%
Water retention: 45-48%
Total capacity: >2.0meq/l 
Volume change: Na+ - H+ <5%
Stability, temp.: <300°F
Stability pH: 0 – 14

Design Conditions 
Bed Depth: >30 in
Flow rate: 2-5 GPM/ft3
Freeboard: 50% of bed depth
Backwash expansion: 50% of bed depth 
NaCl concentration for regeneration:  5-25%
NaCl flow rate for regeneration: 0.25-0.5 GPM/ft3
Turbidity: <5.0 NTU
Free chlorine: <1 ppm