Specialty Resin
swtwater.com ProSelect™ Silica
ProSelect™ Silica (P/N ER20003) — If you’ve run into silica problems in the past, you know how hard it is to take care of them. Now, we’ve formulated ProSelect™ Silica, the perfect resin to work hand-in-hand with our ProSoft™ Premium softening resin for the purpose of silica removal. At SWT, we respond to your needs.
Regenerable Mixed Bed Demineralizers
Deionization Systems
Chemical Processing
ER20003 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.
ER20003 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™ Silica in the chloride form.
The operating capacity of ProSelect™ Silica for acid removal at various regeneration levels when treating an influent with a concentration of 500 ppm, as CaCO3, is shown in the following table.
CAPACITY, Kilograins per cu.ft.
HCl H2SO4 H2SiO3 H2CO3 H3PO4
4 11.5 14.0 12.6 18.6 16.1
6 13.5 16.3 14.8 19.8 17.8
8 15.2 18.3 16.7 21.6 19.2
10 16.8 20.0 19.8 22.2 20.5
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 ER20003
Polymer Structure Styrene crosslinked with DVB
Functional Group R-N-(CH3)3+X-
Ionic Form (as shipped) Chloride or Hydroxide
Physical Form Tough spherical beads
Screen Size Distribution
  + 16 mesh (US Std.)
  – 50 mesh (US Std.)
5% maximum
1% maximum
pH Range 0 to 14
Water Retention
  Chloride Form
  Hydroxide Form
51 to 60%
65 to 70%
Solubility Insoluble
Approx. Ship. Wt.
  Chloride Form
  Hydroxide Form
43 lb/cu.ft.
41 lb/cu.ft.
Swelling Cl- to OH- Form Approx. 25 to 30%
Total Capacity
  Chloride Form
  Hydroxide Form
1.25 meq/mL min.
1.0 meq/mL min.
Maximum Temperature
  Chloride Form
  Hydroxide Form
170°F (77°C)
140°F (60°C)
Minimum Bed Depth 24 inches
Backwash Rate
  50% Bed Exp. @60°F
(See graph left)
  1.7 gpm/sq.ft.
Regenerant Concentration* 2 to 6% NaOH
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