Who are we? DSW is a family-owned and run water treatment and engineering company. We have over 25 years of experience in a range of engineering disciplines. Why choose us? DSW understand that sometimes more complex water hygiene and engineering issues can prevent problems from being solved in a timely manner. We offer bespoke services that cater for unique problems and, as we complete all services in-house, we avoid the disruption caused by miscommunication often seen within other engineering companies.