Specialty Resin
swtwater.com ProSelect™ HexChrome
ProSelect™ HexChrome (P/N ER20011) is a granular gel weak base anion resin with unique epoxy polyamine functionality. It utilizes a secondary mechanism for chromate removal that causes chromium to precipitate inside the resin matrix when the feed pH is slightly acidic. ProSelect HexChrome is intended for all chromate removal applications. It is shipped in the acid chloride form.
Chromate Removal
ProSelect HexChrome is a unique weak base anion exchanger with a secondary hybrid capture mechanism for chromate. Under neutral to slightly acidic conditions, chromate is first exchanged into the resin, then reduced to trivalent chrome which covalently bonds to the resin backbone. Throughput capacity is many times greater than that provided by the ion exchange groups alone, allowing very high loading and infrequent change-outs. Because the hexavalent chromate reduction step is both time and pH dependent, it is the rate controlling step. Operation at pH greater than 6 requires low flow rates, rest periods, or periodic soak steps at lower pH to allow the reduction step to catch up. Capacities in excess of 5 lbs of chrome (as Cr) per cubic foot of media are routinely achieved with ProSelect HexChrome when operated at optimum pH and flow conditions. ProSelect HexChrome is not affected by common ions such as nitrate, sulfate, or chloride but can be damaged or fouled by high levels of suspended solids, iron, manganese, chlorine, etc.
ProSelect HexChrome Pressure Drop Graph
PRESSURE DROP — The graph above shows the expected pressure loss per foot of bed depth as a function of flow rate at various temperatures.
ProSelect HexChrome Backwash Graph
BACKWASH — The graph above shows the expansion characteristics as a function of flow rate at various temperatures.
ProSelect HexChrome Capacity Graph
CAPACITY — The graph above is based on waters with TDS less than 500 ppm and is for chromate alone, exclusive of other anions. Capacity shown is for the working bed in a worker polisher configuration. No engineering downgrade has been applied.
  Complies with US FDA regulations (paragraph 21 CFR173.25) for potable water applications  
  High capacity media designed for one-time use  
  Large granules provide good physical strength and minimal fines provide low pressure loss  
  Removes chromium from water using weak base anion exchange resin at near-neutral pH.  
  Certified to NSF/ANSI Standard 61  
Part Number ER20011
Polymer Structure Epoxy polyamine
Polymer Type Gel
Functional Group Mixed amines
Physical Form Granules
Ionic Form, as shipped Acid chloride
Total Capacity 2.1 meq/mL min.
Water Retention 52 to 58%
Approx. Shipping Weight 40 lbs./cu.ft.
Screen Size (U.S. Mesh) 12 to 40
Max. Fines Content (<50 mesh) 1%
Uniformity Coefficient 2 approx.
Resin Color Amber to yellow
Max. Continuous Temperature 100°F (38°C)
Minimum Bed Depth 24 inches
Backwash Expansion 25 to 50%
Max. Pressure Loss 20 psi
Operating pH Range 4 to 7 SU
Service Flow Rate 1 to 4 gpm/cu.ft.
ProSelect HexChrome System Configuration Drawing
* CAUTION: DO NOT MIX ION EXCHANGE RESINS WITH STRONG OXIDIZING AGENTS. Nitric acid and other strong oxidizing agents can cause explosive reactions when mixed with organic materials such as ion exchange resins.
SWT Ion Exchange Resin Guide
This information has been gathered from standard materials and or test data that is believed to be accurate and reliable. Nothing herein shall be determined to be a warranty or representation expressed or implied with respect to the use of such information or the use of the goods described for any particular purpose alone or in combination with other goods or processes, or that their use does not conflict with existing patent rights. No license is granted to practice any patented invention. It is solely for your consideration, investigation and verification.
ProSelect™ is a trademark of Safe Water Technologies, Inc.
Safe Water Technologies, Inc.
996 Bluff City Boulevard
Elgin, IL 60120 USA
Telephone: +1.847.888.6900
Facsimile: +1.847.888.6924
E-mail: info@swtwater.com

Last Updated: December 15, 2021