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Key Info

Control bacteria
Remove sediment/filter
WRAS approved filters and UV`s
British made UVs

Ultraviolet systems

An ultraviolet unit coupled with a sediment removal pre-filter is an effective way of controlling bacterial contamination in a water supply where the water is not stored before use. The ultraviolet unit is sized according to the flow rate of the system and will need to deliver a UV dose rate of 40mJ/cm² to destroy the DNA of the bacteria (for a single pass system).


Do I need an ultraviolet treatment unit?

If the property you and your family live in is the only property supplied by a water source, and only your family drink the water, and the water is free from bacteria then you may not be required to install an ultraviolet system by the authorities. However, you do have a duty of care to supply a safe supply of water to anyone who may drink from your supply. If the supply is being used by a company/ business or is a shared supply then a risk assessment and suitable treatment is required by law; this is enforced by your local authority. Ultra violet units are a cost effective way of controlling bacterial levels in the water supply.

FWT design and build ultra violet treatment systems for a variety of flow rates, from small households to large commercial concerns. We stock and install the British made Daro, Saphir range of ultra violet units; these are made to an extremely high standard with a stainless steel chamber and robust control box. As with all ultra violet units a sediment removal pre-filter with a minimum of a 5-micron rated filter will need to be installed prior to the unit to ensure it has a clear sample of water to treat. Ultra violet systems are designed to be used at the point of use; once the water has been treated it is not best practice to store the water as it may become re-contaminated.

FWT will size the filter and ultraviolet unit to the peak flow rate of the system. To work effectively the filter system will require a minimum of 2-3 Bar pressure, if this is not the case (as with some spring fed systems) a booster pump may be required.

All UV systems require regular checks and an annual service to change the lamp and maintain the effectiveness of the system. FWT offer a full installation and maintenance service coupled with an annual reminder, if required. Most UV lamps and spares are held in stock for immediate despatch.

(Please visit our shop to buy ultraviolet treatment units)

Further information is available

Background information UV

Basic UV layout

Daro Saphir + Ultraviolet unit flyer

Daro Saphir Ultraviolet unit flyer

Step by step guide to installing an Ultraviolet System


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