At Duff Co., we specialize in solutions. Call or email us today to learn about our expertise in commercial and industrial water treatment system design, installation and maintenance. Our industry-best technical support is always available to help you troubleshoot.

The experts at Duff’s Philadelphia area headquarters understand water treatment. We build OEM systems with the consideration of staff resources, space limitations, future expansion, budget, reliability and redundancy requirements, monitoring, reporting, maintenance, environmental impact and public image: In short, with Duff you get solutions, not just equipment.

We manufacture water treatment systems to order, tailored to your specifications and the water at the source. Among our standard equipment, we offer the following systems:

  • Commercial Water TreatmentSofteners
  • Deionizers / Demineralizers
  • Ion Exchange Systems
  • Reverse Osmosis (RO)
  • Filters
  • Side Stream Filtration
  • Ultrapure Water / Ultrafiltration (UF)
  • Ultraviolet (UV) Water Disinfection

We also stock the largest selection of specialty media and resins, plus all the components and spare parts to any water treatment system.

Rely on our Expertise

For pumping applications, customers receive the benefit of Duff Co.’s extensive inventory of Grundfos pumps, whether your system calls for a chemical dosing pump or a centrifugal pump. While we stock many brands, our customers rave about the best-in-class Grundfos SMART Digital Dosing pumps, which feature a gentle yet powerful stepper motor. The result is an incredibly durable, remarkably accurate–and still affordable–dosing pump. For all your chemical dosing questions, Duff Co. experts are available to help.

In addition, we provide value-added services such as fabrication of skidded water treatment systems, start-up assistance, and free troubleshooting–any day, any time.