ResinTech CG8 is a premium grade, high capacity, gelular, sulfonated, polystyrene cation resin supplied in the sodium or hydrogen form as moist, tough, uniform, spherical beads. ResinTech CG8 is intended for use in all water softening, dealkalization, deionization and chemical processing applications.

Features and Benefits

• Complies with FDA regulations
• Complies with USDA regulation for potable water systems
• Certified NSF/ANSI-61 certified for material safety
• Highly uniform particle size, low pressure drop
• Superior physical stability
• Low color throw

Pressure Drop

The chart below shows the expected pressure loss per foot of bed depth as a function of flow rate, at various temperatures.

ResignTech CG8 Pressure Drop Chart

Backwash Expansion

After each cycle the resin bed should be backwashed at a rate that expands the bed 25 to 50 percent. This will remove any foreign matter and reclassify the bed. The chart below shows the expansion characteristics of ResinTech CG8 in the sodium form.

ResignTech CG8 Backwash Expansion Chart

Operating Capacity

The Sodium cycle operating capacity of ResinTech CG8 for hardness removal at various regeneration levels with an influent calcium/magnesium ratio of 2/1 and a hardness level of 500 ppm, as CaCO3, is shown in the following table:

5 20.0
7.5 25.4
10 29.0
15 33.0

The following table shows the hydrogen cycle relationship between operating capacity and regeneration level when using sulfuric acid as the regenerant:

Capacity Kilograins /cu.ft.
500 ppm as CaCO3
500 ppm as CaCO3
5 19 11.5
7.5 23 12.8
10 25.3 13.6
15 28.1 14.5
20 29.7 15.0

The capacity data is based on an acid concentration of 2 percent in order to avoid calcium sulfate precipitation. Higher operating capacities could be obtained using a stepwise increase in acid concentration to avoid the calcium problem.

Physical Properties
Polymer Structure: Styrene Crosslinked with DVB
Functional Group: R-(SO3)-M+
Ionic Form, as shipped: Sodium or Hydrogen
Physical Form: Tough, Spherical Beads
Screen Size Distribution:
+16 mesh (U.S. Std) < 5 percent
-50 mesh (U.S. Std) < 1 percent
pH Range: 0-14
Sphericity: > 93 percent
Uniformity Coefficient: Approx. 1.6
Water Retention
Hydrogen Form: 47 to 54 percent
Sodium Form: 42 to 49 percent
Solubility Insoluble
Approximate Shipping Weight:
Hydrogen Form: 50 lbs/cu.ft.
Sodium Form 52 lbs/cu.ft.
Swelling Ca+2 or Na+ to H+ 5 to 9 percent
Total Capacity
Sodium Form: 1.9 meq/ml min
Hydrogen Form: 1.8 meq/ml min
Suggested Operating Conditions
Maximum Temperature:
Sodium Form: 280°F
Hydrogen Form: 265°F
Minimum Bed Depth: 24 inches
Backwash Rate: 25 to 50% Bed Expansion
Regenerant Concentration:
Hydrogen Cycle: 10% HCl or 1 to
8% H2SO4
Sodium Cycle: 10% to 15% NaCl
Regenerant Flow Rate: 0.5 to 1.5 gpm/cu.ft.
Regenerant Contact Time: At least 20 Minutes
Regenerant Level: 4 to 15 pounds/cu.ft.
Displacement Rinse Rate: Same as Regenerant Flow Rate
Displacement Rinse Volume: 10 to 15 gallons/cu.ft.
Fast Rinse Rate: Same as Service Flow Rate
Fast Rinse Volume: 35 to 60 gallons/cu.ft.
Service Flow Rate 2 to 10 gpm/cu.ft.