Treatment of PWS

Even if the water in your private water supply looks clear, it is highly likely that it needs some form of treatment in order to remain safe at all times. The quality of water in many private water supplies can change quickly, and any treatment process needs to be able to deal with the full range of water that it will encounter.

How do I know what treatment I need?

A risk assessment needs to be undertaken to determine the hazards that may be present on a PWS, so that the appropriate treatment processes can be selected to deal with them. It is likely that some samples will need to be taken to determine the composition of the water.

The decision as to the type of treatment needed is best left to an expert. As an absolute minimum, some form of disinfection will be required to kill any bacteria in the water. If there are sometimes particles or dissolved metals in the water, at least one filtration stage will be needed. Many supplies in Scotland are coloured with organic compounds derived from peaty soils. These compounds can reduce the effectiveness of ultra-violet disinfection systems and may need to be removed using special filters. Many waters in Scotland are naturally very soft, meaning that they can be corrosive to metal pipework and fittings. Filters containing alkaline media can be used to correct this.

The reliable treatment of a PWS to an adequate standard can be costly.

The reliable treatment of a PWS to an adequate standard can be costly, and it is important to realise that any treatment installed will need to be maintained, meaning there is a need for ongoing expenditure. It is important to periodically check that any treatment is operating correctly and that routine maintenance tasks are done and recorded. If you cannot undertake these yourself, it may be worth taking out a service contract with a reputable supplier.