Composite filter faucet water softening system for high-flow ca2+ and mg2+ removal
A four-layer composite filter designed for faucet-mounted water softening that removes Ca2+ and Mg2+ ions at flow rates above 1.5 L/min. The reusable composite material achieves up to 54 mg/g adsorption capacity and avoids secondary contamination, offering a practical alternative to conventional water softening methods.
Overview
This solution offers a faucet-mounted water filtration system built around a proprietary four-layer composite filter engineered for the partial removal of Ca2+ and Mg2+ ions from hard water. Designed as a point-of-use alternative to conventional water softening methods, the system targets higher flow rates above 1.5 L/min while remaining compact enough for household or light-commercial installation. The composite filter media can be regenerated and reused, reducing material waste and ongoing operating costs compared to single-use adsorbents.
The technology addresses a key gap in the water treatment market: most existing adsorbent materials are formulated for drinking water purification rather than targeted hardness reduction, often requiring long contact times, frequent regeneration, and producing secondary waste streams. By contrast, this composite system is designed to controllably remove hardness ions without introducing secondary contaminants, simplifying operation for end users.
Technical specifications
- Four-layer composite filter architecture optimized for selective Ca2+ and Mg2+ capture
- Continuous column adsorption capacity of up to 54 mg/g at 100 mL/min with 250 mg/L CaCO3 influent
- Maintains 31 mg/g adsorption at elevated flow rates up to 700 mL/min
- Retains approximately 48% Ca2+ removal efficiency after regeneration
- Effluent testing shows no indication of secondary contamination
- Target operating flow rate above 1.5 L/min for practical faucet integration
- Composite material designed for reuse across multiple adsorption-desorption cycles
Technology readiness level
The composite material has been demonstrated in laboratory-scale batch and continuous column studies, confirming adsorption capacity, flow-rate performance, and post-regeneration efficiency. Future validation will focus on producing highly uniform composite material, evaluating performance across varying hardness levels, and benchmarking against commercial softening media at a target hardness reduction of 450 mg/L. The faucet filtration prototype is positioned for further development toward field testing and commercialization, with opportunities for co-development and licensing partnerships.
About University of Wisconsin, Milwaukee
University of Wisconsin–Milwaukee is a comprehensive public research university in the state’s largest metro, pairing broad academic breadth with an applied, urban mission. Industry engages through an innovation campus and research park that co-locate university labs with startups and corporate teams, plus shared-use core facilities. Its location puts partners near a major regional medical center and within a leading freshwater and advanced manufacturing cluster, enabling pilots, internships, and joint development. Research is supported by competitive federal funding from agencies such as NSF, NIH, and DOE. A dedicated technology transfer office and affiliated foundation manage IP, licensing, corporate agreements, and seed funding to accelerate commercialization.
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