Specialty Resin
swtwater.com MetalEase-AS5™
Arsenic Removal Media
MetalEase-AS5 is a chloride form arsenic selective hybrid anion exchange resin. It has hydrated iron oxide monoatomically dispersed throughout the polymer. The media captures arsenate first by ion exchange and then by absorption into the iron oxide hybrid. MetalEase-AS5 is intended for arsenic removal from potable water, and can also be used as an ion exchanger for removal of uranium and other trace level contaminants.
MetalEase-AS5 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.
MetalEase-AS5 Backwash Expansion Graph
BACKWASH — The graph above shows the expansion characteristics as a function of flow rate at various temperatures.
Arsenic Removal
Under ideal conditions MetalEase-AS5 will reduce 50 ppb of arsenate to less than 10 ppb for more than 500,000 gallons per cubic foot. Limiting factors are high pH, high silica concentration, and high sulfate concentration. Capacity can also be reduced by intermittant operation and various foulants, notably suspended solids.
MetalEase-AS5 Throughput Capacity Graph
THROUGHPUT CAPACITY — Capacity is based on clean waters that do not contain significant levels of organics, iron, manganese, or other contaminants. The graph above is based on 50 ppb of arsenate (As+5) in the feed, and TDS less than 500 ppm. MetalEase-AS5 removes only modest amounts of As+3, therefore pre-oxidation to As+5 may be required. No engineering downgrade has been applied.
Silica Removal
MetalEase-AS5 can be used at moderate pH to remove silica. At a flow rate of 0.5 BV/min, removal efficiency of ninety percent is possible for several hundred bed volumes of throughput. Silica does not dump as the resin exhausts. Even though silica removal is not complete, some lowering of silica occurs for hundred of thousands of bed volumes.
MetalEase-AS5 Suggested System Configuration
MetalEase-AS5™ is a trademark of Safe Water Technologies, Inc.
  Highest arsenic removal capacity of any organic based arsenic removal media  
  No arsenic dumping  
  Superior physical stability  
  Controlled particle size, low pressure drop  
  Conforms to paragraph 21CFR173.25 of the Food Additives Regulations of the US FDA  
  NSF/ANSI-61* Certified for Material Safety  
  * NSF/ANSI-61 compliance requires conditioning with a minimum 20 bed volume rinse prior to first use.  
Chloride Form METALEASE AS5
Polymer Structure Styrene/DVB
Polymer Type Gel
Functional Group Hybrid
Physical Form Spherical beads
Resin Color Black
Ionic Form (as shipped) Chloride
Water Retention 35 to 45%
Screen Size Distribution 16 to 50 (US mesh)
Maximum Fines Content 1% (< 50 mesh)
Minimum Sphericity 93%
Uniformity Coefficient 1.6 approx.
Approx. Ship. Wt. 50 lb/cu.ft.
Packaging 1 cu.ft. box
Maximum Temperature 170°F (77°C)
Minimum Bed Depth 24 inches
Backwash Expansion 50 to 75%
Maximum Pressure Loss 25 psi
Operating pH Range 4 to 8
Service Flow Rate 1 to 5 gpm/cu.ft.
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 Filtration Media Guide
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 30, 2021