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Highly selective for monovalent anions (e.g., chloride, nitrate) in the presence of multivalent ions such as sulfate.
Optimized macroporous polystyrene matrix providing excellent kinetic performance and resistance to fouling.
Consistent spherical bead morphology ensures uniform hydraulic distribution and low pressure drop in service.
Regenerable with sodium chloride solution, enabling cost-effective cyclic operation.
Compliant with FDA 21 CFR §173.25 and EU Regulation (EC) No 1935/2004 for indirect food contact applications.
Removal of nitrate from drinking water and groundwater sources.
Chloride reduction in pharmaceutical process water systems.
Pre-treatment polishing for ultrapure water (UPW) generation in semiconductor manufacturing.
Targeted anion removal in food & beverage production water circuits.
Effluent polishing in electroplating and metal finishing wastewater streams.
| Chemical Type | Strong Base Anion Exchange Resin (Type I Quaternary Ammonium) |
| Product Form | Moist, spherical beads |
| Appearance | Off-white to light yellow, translucent beads |
| Functional Group | –N(CH₃)₃Cl |
| Ion Form | Chloride form (Cl⁻) |
| Moisture Content | 46 – 50 % (w/w) |
| Particle Size Range | 0.4 – 1.2 mm (≥95% retained on 0.315 mm sieve) |
| Uniformity Coefficient | ≤ 1.6 |
Q1: What is the primary functional group and ionic form of LEWATIT MonoPlus SR 7?
A: LEWATIT MonoPlus SR 7 is a strongly acidic cation exchange resin based on a sulfonated polystyrene-divinylbenzene matrix, supplied in the sodium (Na⁺) form for softening and selective ion removal applications.
Q2: Is this resin suitable for potable water treatment?
A: Yes — LEWATIT MonoPlus SR 7 is designed for use in drinking water systems and complies with relevant global regulatory frameworks for materials in contact with potable water, including NSF/ANSI Standard 61 when properly regenerated and rinsed.
Q3: How does SR 7 differ from conventional gel-type cation resins in terms of kinetics and capacity?
A: As a macroporous monodisperse resin, SR 7 offers more uniform particle size distribution and enhanced mechanical stability, resulting in improved flow dynamics, reduced pressure drop, and consistent exchange performance across varying service cycles compared to standard gel-type resins.
Q4: What regeneration chemicals are recommended for LEWATIT MonoPlus SR 7?
A: Sodium chloride (NaCl) is the standard regenerant for softening applications. For full-cycle regeneration or specific process requirements, hydrochloric acid (HCl) may be used — always following manufacturer guidelines for concentration, flow rate, and rinse protocols.
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