Reverse osmosis water purifier
Derwent water systems

Derwent's Reverse Osmosis UK-manufactured plants are used to produce high-quality demineralised water, especially where the client looks to minimise the use of chemicals which are the regenerants associated with the more conventional demineralised ion exchange process (see Demineralisation).
R O Plant is used extensively in the food and beverage industry (especially the brewing industry), pharmaceutical and the electronics industries.
Derwent Water Systems uses a computerised programme for studying the water chemistry so as to select the most suitable membrane configuration and in order to provide a plant which gives a low water-rejection rate.
Further help is provided to the client to make use of, often by further treatment, of the reject water.
The standard Derwent range of R O units utilises the most modern membrane technology and consists of a modular design comprising of:
- Skid-mounted epoxy-coated steel base
- Spiral-wound membranes in high-pressure GRP vessels
- Multi-stage high-pressure stainless steel feed pump
- Control panel
- Pre-filter
- Pressure and flow gauges for feed, reject and permeate
- Water quality indicator on conductivity alarm