Specialty Resin
swtwater.com ProSelect™ Tannin
ProSelect™ Tannin (P/N ER20001) is the choice for color, organics, and tannin contaminated waters. It works as an organic screen, either as a stand alone prefilter for a softener, or in some applications as a media which is simply added to an existing softener. ProSelect™ Tannin will sit on top of the existing softening bed to protect it and remove organic (heme) iron as well. ProSelect™ Tannin regenerates with salt.
Remove Naturally Occurring Organics
Remove Tannin
Remove Organic Color
ER20001 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.
ER20001 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™ Tannin in the chloride form.
The potential throughput capability is dependent on the water analysis and the level of both sulfate and TOC. However, the actual multiple cycle operating capacity is also limited by the amount of organics that can be regenerated from the resin. At regenerant levels above 10 lbs./cu. ft. the contact time is more important than the dose level for removing organics from the resin.
Typical Volume Operating Capacities
Gallons Per Cubic Foot Per Service Cycle
  A B C
Single Use 1740 4475 900
Multiple Cycle 1425 1050 900
Above capacities based on salt regeneration, 60 minutes contact time, plus 30 minutes post-regenerant soak, all at ambient temperatures. The three examples above are based on the following water analysis:
Influent Water Analysis
PPM as CaCO3
  A B C
TOC (as C) 3 4 3
SO4 51 17 100
Cl 38 85 35
HCO3 65 100 10
Above 10 lbs./cu.ft. dose, the amount of organics removed during regeneration will be proportional to the total contact time of the regenerant in the resin bed, including the displacement rinse (slow rinse) plus the post-regenerant soak time for up to 100 minutes. Longer contact times provide only marginal benefit. It is recommended that a minimum regenerant contact time of 60 minutes be used. If more capacity is needed, then a post-regenerant soak between the regenerant introduction and the displacement should be added.

Once the potential throughput capacity is determined, the regenerant contact time and dose required to remove the organics is determined. Comprehensive performance information is available for specific water analysis (bicarbonate, chlorides, sulfate, and TOC) from the manufacturer.

In some cases the regeneration process will limit the throughout capacity.
ProSelect™ is a trademark of Safe Water Technologies, Inc.
  Conforms to paragraph 21 CFR173.25 of the Food Additives Regulations of the FDA  
  Reversible exchange of organics  
  Superior physical stability  
  No fishy odor  
  Certified to NSF/ANSI Standard 61  
Part Number ER20001
Polymer Structure Unique porous Styrene with DVB
Functional Group R-N-(CH3)3+Cl-
Ionic Form (as shipped) Chloride
Physical Form Tough spherical beads
Screen Size Distribution
  + 20 mesh (US Std.)
  – 50 mesh (US Std.)
20% maximum
1% maximum
pH Range 0 to 14
Water Retention 70 to 85%
Solubility Insoluble
Approx. Ship. Wt. 41 lb/cu.ft.
Swelling Cl- to OH- Form Approx. 30%*
Maximum Temperature 170°F (77°C)
Minimum Bed Depth
  Layered bed **
24 inches
6 inches **
Backwash Rate
  50% Bed Exp. @60°F
(See graph left)
  0.85 gpm/sq.ft.
Regenerant Option 1 10% NaCl
Regenerant Option 2 10% NaCl plus
0.5% NaOH
Regenerant Option 3 5 to 10% NaCl plus
0.5% Na2CO3
Regenerant Temperature 60 to 120°F
Regenerant Flow Rate 0.1 to 0.5 gpm/cu.ft.
Regenerant Level 10 lb NaCl/cu.ft. plus a proportional amount of NaOH or Na2CO3
Post Regenerant Soak Time 60 minutes minimum
Displacement Rinse Rate 0.1 to 0.5 gpm/cu.ft.
Displacement Rinse Volume 10 to 15 gal/cu.ft.
Fast Rinse Rate 1 to 2 gpm/cu.ft.
Fast Rinse Volume 35 to 60 gal/cu.ft.
Service Flow Rate 1 to 2 gpm/cu.ft.
Pressure Drop (See graph left)
* OH cycle operation not recommended.
Layered beds (cation plus ProSelect™ Tannin) require frequent regenerations and significantly lower flow rates during regeneration. Capacity is lower than stand alone systems and leakage is higher.
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
Iron Removal Comparison Chart
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: August 14, 2017