Quality Water Services designs water treatment systems specially for photo processing labs. Based in Ponca City, Okla., the business has sold and serviced all areas of commercial, residential and recreational water treatment systems for over 50 years. Its flagship product is a renewable rinse water treatment system, a demineralizing (ion exchange) water purifier, which is targeted towards small and large photo processors in the region. Its variants include QWS-47 for small processors and QWS-81 for large processors.. Drinking Water Systems