DWI Approved Products
Barr + Wray has extensive experience supplying DWI (Drinking Water Inspectorate) approved filtration products to support the delivery of safe, high-quality potable water across the municipal water sector.
DWI-Approved Filtration Solutions for Municipal Water Treatment
We are a trusted supplier of DWI (Drinking Water Inspectorate) approved cartridge filters and housings, supporting municipal water companies in delivering high-quality, compliant potable water to the public.
We supply a full range of meltblown polypropylene filter cartridges – including the SupaSpun II R31, which is specifically designed and qualified for use in public water supplies.
Approved under DWI reference 56/4/702, SupaSpun II R31 cartridges have been widely adopted by leading UK water utilities for their exceptional performance in turbidity reduction, particulate removal, and protection of downstream treatment processes. These cartridges, manufactured by Amazon Filters, have also passed BS 6920 Part 3 testing, confirming their suitability for use in contact with cold potable water.
In addition to filter cartridges, Barr + Wray also supplies DWI-approved filter housings, certified under DWI reference 56/4/879, ensuring a complete, compliant filtration solution.
Our engineering team provides full system design, including skid-mounted filtration units, retrofits, and technical support tailored to existing infrastructure. With a focus on quality, reliability, and regulatory compliance, Barr + Wray enables water companies to maintain the highest standards in public water supply treatment.
In addition, we supply DWI-approved ion exchange resins specifically designed for colour correction, and organics control (including humic and fulvic acids). These resins are selected for high capacity, chemical stability, and regeneration efficiency – ensuring long-term performance and cost-effectiveness.
With in-house design and system integration capabilities, Barr + Wray supports water companies with fully tailored solutions, including skid-mounted systems, resin replacement services, and technical support.
Our products and expertise ensure reliable compliance, operational efficiency, and consistent water quality for public water supply networks.
Process + Water Solutions
Our core services span the full spectrum of industrial water engineering.
Filtration Systems
Advanced filtration technologies tailored to specific contaminants, flow rates, and industry standards.
Pumping Solutions
High-performance pumps for fluid transfer, dosing, and pressure management across diverse applications.
Water Treatment
Design and installation of systems for clean water supply, effluent treatment, and resource recovery.
Consultancy
Expert advice on compliance, sustainability, and system optimisation to support long-term operational goals.
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Our engineers are ready to help you scope, design, and deliver the right solution for your site.
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