Most water supplies within the UK are derived from a bore hole supply the treatment of which will vary dramatically dependent upon the aquifer from which the water is extracted.
Should you decide to install your own bore hole the water quality obtained will depend on your location and the aquifer. As a general rule the East Side of England is limestone producing waters with a high total hardness, the West of England, Wales and most of Scotland is granite rock which produces a good overall quality water although often with iron/manganese contamination and anywhere in near the coast can have saline ingress to greater or lesser amounts.
Any water quality can be adjusted to suit your requirements.
In some instances, the water may be saline (contaminated by sea water). This is relatively straight forward to treat using reverse osmosis.
Typically bore-hole waters may be hard having high levels of calcium and magnesium salts. In drinking water this may not be a problem but for process applications additional treatment will probably be required.
Typical pre-treatment steps are as follows: –
- Filtration – to remove iron and manganese either for potable or process applications, any suspended solids and occasionally any organic contamination.
- Softening – to remove the hardness salts (in drinking water a percentage of the hard water is blended back to meet the drinking water standards).
- Reverse Osmosis – to remove high levels of minerals either due to saline contamination or because of the aquifer type.
- Disinfection – either by chemical addition such as chlorine or chlorine dioxide or Ultra-Violet light.
Once treated the financial benefits of using a private bore-hole supply over and above utility company supplied water are such that the payback will typically be in a matter of months even after the pre-treatment plant capital and running costs are taken into account.