ALDEX CR Series
CR 26 Iron, Manganese, Hydrogen Sulfide and Arsenic Removal Media
NSF/ANSI 61 Certified. Aldex CR 26 is a special media designed to provide excellent catalytic properties required for the removal of many contaminants from potable and non-potable aqueous streams. Aldex CR 26 is an insoluble media that oxidizes species in solution including hydrogen sulfide, iron and manganese. Metal-oxide nano-particles are precipitated within the resin bed where they form very strong chemical bonds with arsenite (As III) and arsenate (As V). This allows Aldex CR 26 to thoroughly and effectively remove arsenic along with Fe, Mn and H2S.
CR 26 Features
Chemical Free Regeneration
Aldex CR 26 does not require chemicals such as chlorine dioxide, potassium permanganate, chlorine or sodium chloride brine solution for regeneration. The oxidative chemical locked inside Aldex CR 26 beads is regenerated via the dissolved oxygen in the backwash water.
Potable and Non-Potable Water Applications
Aldex CR 26 requires less contact time and is like standard softening resins in bulk density and handling making it an ideal choice for point-of-entry (POE) systems. Aldex CR 26 can be backwashed at lower flow rates to achieve the ideal bed expansion needed to remove metal-oxide precipitates generated during the service cycle. Aldex CR 26 is easy to handle versus other oxidative media and many naturally occurring zeolites.
Multiple Contaminant Removal
Aldex CR 26 was initially designed for the selective removal of iron and manganese but testing has shown the product to be ideal for multi-contaminant removal. See below for a summary of various tests performed to date.
Expected Service Life
Due to the unique nature of Aldex CR 26 and its function as an oxidizing agent encapsulated within an ion exchange bead, a long service life of 3 to 5 years is expected.
A material safety data sheet is available for Aldex CR 26. Copies can be obtained from Aldex Chemical Co., LTD. Aldex CR 26 is not a hazardous product and is not WHMIS controlled.
CR 26 General Guidelines
- The media can treat water having an iron content above 10 ppm, but the process is not economical particularly for large flow rates. Hence it is recommended to remove iron by pretreating the water by aeration, followed by clarification and filtration. Aldex CR 26 shall then be used as a polishing media.
- Free chlorine should be removed before passing water through the media.
- The treated water from Aldex CR 26 will have an iron content of < 0.1 ppm.
- Aldex CR 26 removes dissolved iron from water, which is present as ferrous iron. Iron can also exist in other forms such as bacterial iron, soluble organic iron and colloidal iron. Those forms of iron cannot be removed effectively by Aldex CR 26.
- All sequestering agents including polyphosphates and meta-phosphates should be added after the Aldex CR 26 unit.
- For high iron content in feed water (> 10 ppm), it is recommended to backwash the unit with treated water, so as to avoid contamination of the bottom portion of the bed.
- The unit must be backwashed at a specified flow rate for effective removal of precipitated iron and suspended solids.
- The backwash frequency shall be every 12 to 24 hours for a continuous operating unit. If the unit is operated intermittently, backwash at the end of each cycle.