Filtration Media
swtwater.com MetalEase-ALF™
Arsenic, Lead, & Fluoride Removal Media
MetalEase-ALF™ (Arsenic, Lead, Fluoride) is a high capacity synthetic adsorbent media that is highly selective for arsenic, lead, and fluoride. The extremely high surface area and pore distribution gives this media the highest possible operating capacity and lowest possible leakage.
 
 
Arsenic Removal
Inorganic arsenic (arseniite and arsenate) can be removed by MetalEase-ALF. The process is very pH sensitive and capacity decreases rapidly when the pH is below 5.5 or above 6.0. Arsenite is not removed nearly as well as arsenate; therefore, prechlorination to convert arsenite to arsenate may be required. Arsenic removal is also affected by temperature and by the TDS of the feedwater. Increasing temperature increases capacity while increasing TDS decreases capacity.

Equilibrium capacity for arsenate (1,000 ppm TDS, 25°C, 1 mg/L As) is approximately 0.66 lbs/cu.ft. Operating capacity to a 10% leakage end point is approximately 10% of the equilibrium capacity. Regeneration can be accomplished by using 3 to 4 lbs/cu.ft. of 2 to 4% sodium hydroxide, over 20 to 30 minutes, followed by nuetralization with acid to a pH of 5 to 6.

Lead Removal
Dissolved lead is adsorbed by MetalEase-ALF and is not normally regenerable. Capacity for lead is at least 0.4 lbs/cu.ft. while maintaining greater than 98% lead removal. This process is not dramatically affected by flow rate, temperature, or TDS. However, pH should be maintained above 6.0 as lead removal drops under acidic conditions, and below 10 as lead precipitates under basic conditions.

Fluoride Removal
Fluoride is removed by MetalEase-ALF by a chemical reaction with the media. The process is flow and pH sensitive. The best results are obtained when the flow is limited to about 1 gpm/cu.ft. and the pH is held at 5.5. Higher flows and higher or lower pH causes a significant loss of capacity. The best capacity obtainable is approximately 0.2 lbs/cu.ft. Leakage of fluoride is generally less than 0.1 mg/L to breakthrough.

Regeneration can be accomplished using 3 to 4 lbs/cu.ft. of 2 to 4% sodium hydroxide over 20 to 30 minutes, followed by neutralization with acid to a pH of 5 to 6.
 
 
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.
 
 
Warning
For safety and handling purposes, avoid contact with eyes, skin, and clothing. Avoid breathing the dust and always use adequate ventilation. Wash thoroughly after handling. Keep away from heat and easily oxidizable materials.
 
 
MetalEase-ALF™ is a trademark of Safe Water Technologies, Inc.
 
    Features & Benefits:    
  Does not release arsenic, lead, or fluoride except during regeneration and can be sent to landfill when used in single pass applications (ie. cartridges, exchange tanks, rebedding, etc.)  
  Removes metals through a combination of adsorption and chemical reaction with the media, thus the removal is not dependent on ion exchange  
  Uniform particle size with minimal shrinkage or swelling and low pressure loss  
  Physically stable and can be used over a wide pH range  
  Certified to NSF/ANSI Standard 61 for drinking water applications  
 
TYPICAL PROPERTIES
Part Number METALEASE ALF
Chemical Structure Crystalline Aluminum Oxide
Active Ingredients 92% minimum
Physical Form Tough Uniform Granules
Color White
Surface Area 315 to 330 m²/gr
Mesh Size 28 x 48
pH Range 4 to 10
Water Retention Less than 5%
Solubility Nil
Net Weight 47 to 48 lbs/cu.ft.
Shipping Weight 50 lbs/cu.ft.
Packaging 1 cu.ft. box or
37 cu.ft. supersack
 
SUGGESTED OPERATING CONDITIONS
Max. Temperature 100°C (212°F)
Max. Free Chlorine 1 ppm
Min. Bed Depth 36 inch minimum
(5 to 7 foot preferred)
Backwash Rate To achieve 10 to 25% expansion
Continuous Flow Rate 1 to 2 gpm/cu.ft.
Intermittent Flow Rate 1 to 5 gpm/cu.ft.
ADDITIONAL INFORMATION:
SWT Filtration Media Guide
Iron Removal Comparison Chart
 
 
METALEASE ALF 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 ALF Backwash Graph
 
BACKWASH — The graph above shows the expansion characteristics as a function of flow rate at various temperatures.
 
 
 
 
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
http://www.swtwater.com

Last Updated: August 15, 2017