Heol Tynewydd, Blackwood, NP12


This system in South Wales was grossly under sized. It had just a small particulate filter that is usually installed under a sink, for a single tap supply and one of the smallest flow UV units we have seen on a house supply. In addition to this it was installed incorrectly.

This water is supplied from a borehole, but the drillers had drilled into a large underground aquifer, that was subject to water levels rising and falling with rain fall.

This was a problem for us because in low rainfall, the iron levels were low, but with high levels of rainfall the iron content rose into the 10’s of thousands micrograms (legal limit being 200 micrograms). This meant that we had to install a system that had to deal with extreme levels of iron, manganese and hardness some of the time, and relatively low levels as the norm.

The Solution

Stage 1
This reduced the particulate and started the oxidisation process to reduce of the Iron content.

Stage 2
We used a media designed to reduce iron in large quantities in both dissolved and in colloidal form.

Stage 3
In the process was an ion exchange unit, this would be used to reduce any iron that migrated through the first two filters, it also reduced the manganese and the hardness found in the borehole water supply.

Other Remarks

We always check a system we install thoroughly, down to the finest detail. Here, our post-treatment, on-site sampling indicated that this new installation was very successful left, but the water was slightly acidic. To counteract this, a small pH correction vessel was installed to keep the water at a neutral level.

Finally we installed a 5 micron particulate Pre-filter and Ultra Violet unit to sanitise the borehole water supply.

Useful Info

What is hard water and is it really a bad thing?

Hard water has high mineral content and is formed when water passes through limestone and chalk. This is a natural process and common throughout the country.

Hard drinking water may have health benefits, but over time it leads to limescale buildup on kettles, water heaters and other appliances. This can be a serious problem for industry. A quick indicator that you are in hard water area is that soap will not foam as readily as with soft water.

Water softening is used to reduce hard water’s effects.

Manganese – why is this a problem?

Manganese is an essential nutrient in very small amounts but too much can potentially cause serious health issues such as  toxicity to the nervous system and Parkinson’s-like symptoms – particularly in children, the elderly, and pregnant mothers.

Is iron in water bad?

Over time iron in your water supply can cause discolouration and even affect laundry and crockery. The water can taste metallic and can even be detected in coffee and tea, etc. It can also darken drinks; food cooked in water containing iron can turn dark and may also absorb the metallic flavour.

What’s so special about UV?

UV (ultra-violet) filtration will kill harmful bacteria the water and because it involves no chemicals it presents no long-term dangers to health which arguably may be present with other methods.

Products used on this project