Specialty Resin
swtwater.com ProSelect™ General Purpose Anion
ProSelect™ General Purpose Anion Resin (P/N ER20004) is designed for multi-bed regenerable systems. It has the highest alkalinity loading capacity of all anion resin types. But what truly makes this a superior resin is its ability to resist organic fouling from water sources where naturally occuring organics are found (ie. surface water). This special formulation makes ProSelect General Purpose easier to regenerate and a longer lasting resin as well.
Chemical Processing
ER20004 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.
ER20004 Backwash Graph
BACKWASH — After each cycle the resin bed should be backwashed at a rate that expands the bed 50 to 75 percent. This will remove any foreign matter and reclassify the bed. The graph above shows the expansion characteristics of ProSelect™ General Purpose in the chloride form.
per cu.ft.
per cu.ft.
4 21.0
6 22.5
8 23.5
10 24.4
12 24.9
  The Operating Capacity of ProSelect™ General Purpose Anion Resin for acid removal at various regeneration levels when treating an influent of 500 ppm of HCl, as CaCO3.
per cu.ft.
per cu.ft.
4 19.5
6 20.7
8 21.6
10 22.2
12 22.6
  The Salt Splitting Capacity of ProSelect™ General Purpose Anion Resin at various regeneration levels, based on an influent water containing 500 ppm of NaCl, as CaCO3.
ProSelect™ is a trademark of Safe Water Technologies, Inc.
  Conforms to paragraph 21 CFR173.25 of the Food Additives Regulations of the FDA  
  Uniform particle size, low pressure drop  
  Superior physical stability  
  Organic fouling resistance, high operating capacity  
  Certified to NSF/ANSI Standard 61  
Part Number ER20004
Polymer Structure Styrene crosslinked with DVB
Functional Group R-N-(CH3)2 C2H5OH+ X-
Ionic Form (as shipped) Chloride or Hydroxide
Physical Form Tough spherical beads
Screen Size Distribution
  + 16 mesh (US Std.)
  – 50 mesh (US Std.)
2% maximum
1% maximum
pH Range 0 to 14
Sphericity 93% minimum
Uniformity Coefficient 1.7 approx.
Water Retention
  Chloride Form
  Hydroxide Form
37 to 45%
43 to 50%
Solubility Insoluble
Approx. Ship. Wt.
  Chloride Form
  Hydroxide Form
44 lb/cu.ft.
41 lb/cu.ft.
Swelling Cl- to OH- Form 10 to 15%
Total Capacity
  Chloride Form
  Hydroxide Form
1.45 meq/mL min.
1.30 meq/mL min.
Maximum Temperature
  Chloride Form
  Hydroxide Form
170°F (77°C)
95°F (35°C)
Minimum Bed Depth 24 inches
Backwash Rate
  50% Bed Exp. @ 60°F
(See graph left)
  2.7 gpm/sq.ft.
Regenerant Concentration * 2 to 6%
Regenerant Flow Rate 0.25 to 1.0 gpm/cu.ft.
Regenerant Contact Time 60 minutes minimum
Regenerant Level 4 to 10 lb/cu.ft.
Displacement Rinse Rate 0.25 to 1.0 gpm/cu.ft.
Displacement Rinse Volume 10 to 15 gal/cu.ft.
Fast Rinse Rate 2 to 4 gpm/cu.ft.
Fast Rinse Volume 35 to 60 gal/cu.ft.
Service Flow Rate 2 to 4 gpm/cu.ft.
Pressure Drop (See graph left)
* 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.
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