Ultra Violet Filtration

Ultra Violet filtration is the use of Ultra violet rays to in-activate bacteria and hence ‘purify’ drinking  water for consumption.The use of Ultra Violet rays or UV is a natural phenomenon. The sun emits UV rays to act on water in rivers and lakes however in modern society our water is transported in pipe networks and so by mimicking the sun rays inside the pipe-work we can cleanse the water. Many manufacturers utilise a UV lamp in a quartz sleeve for protection and enclose it in a stainless steel chamber or reactor. These UV systems work very well and are mainly used as a ‘point of use’ treatment for water. It is important that if you purchase one and install it in your house or office that you disinfect the pipe-work so that the action of the UV lamp is effective and that the water is not re-contaminated after the lamp with bacteria that might be present in old pipework or ‘dead leg’ pipework. When disinfecting ensure you run all the taps in the house. More information on how the product is made and used can be found at www.tapandwaterfilters.com or follow this link to the UVEO product manufactured by Comap www.tapandwaterfilters.com/product/uveo-uv-lamp/

Much scientific research has been undertaken in recent years to show the benefits of this technology. The key issues with UV is the dose. The dose is dependent on how long the water is present in the chamber of UV rays and how much impurities are contained in the water. The strength of the lamp and number of lamps is also a factor. If is necessary to install a Pre-filter to ensure solid particles are not present in the UV chamber. High levels of iron and lime in the water can also adhere to the sleeve making the lamp ineffective. It is worth changing the lamp each year as most manufacturers only guarantee 9000 working hours on a lamp. The output fades with time effecting the dose.

Many different viruses and bacteria can be inactivated with UV lamps, E,Coli and larger protozoa such as Giardia can be inactivated with relatively low dose levels however Cryptosporidium may require higher doses. A good rule of thumb is to purchase and install a UV unit that has a minimum of 40mj/cm2. Comap wti and Trojan UV are two such companies that supply this standard of product. More information is available at


This report is by the US EPA and covers all the Technical aspects of Ultra Violet Radiation use.

Fluoride in Water

It seems inevitable that this topic arises year on year, Ireland is the only EU country that  supports  a mandatory policy of adding fluoride to drinking water. It arrives in our taps  and our only choice is to filter it out at point of use. This can be performed to a level but it is very difficult to remove altogether , ‘Crystale Roc Eco’  pre-packaged water filtration kit from  tapandwaterfilters.com is one  product that can help solve the problem. There have been many studies into the addition of Fluoride to water and many advocates of it are convinced that adding this chemical to the water supply is good for teeth. Many of our customers who are concerned about their health with stomach and kidney complaints consider fluoride in drinking water  to be a danger to their health.  In a recent article in The Irish Independent, it was stated that there is a growing amount of evidence linking fluoride to cancer, osteoporosis and genetic damage:

In an article recently published in Hot Press, Professor Daniel M. Merfield stated that fluoridation was ineffective and also that it was an uncontrolled dose , the article suggested that this practise began before the side effects were known and that application to teeth was more effective than ingestion.

In another study conducted by Harvard University it was suggested that ‘significantly lower’ IQ scores were present in areas where fluoride levels were highest. The report supported a plausibility of findings against a control that relatively  higher intake of the chemical on a consistent basis may cause neurodevelopment damage.

It seems there are many studies and ongoing concerns by the general public about fluoride in our water however there does not seem to be enough specific information to show it is not good for our health.  Rudolf Ziegelbecker , a scientist at the Environmental Research Centre in Austria declared in an open letter to Medical Research Council in 1990  “ There is no valid scientific evidence for the benefits” referring to Water Fluoridation and Health.

If concerned about the issue purchase an ‘under the sink’ filtration system or a pre-packaged kit and only drink water from this source. These cartridges are usually inter-changable, easily fitted and can be combined with chlorine  and sediment filters to improve the taste  and smell of your water.  It should be worth noting that fluoride is present in many toothpaste  products also except some of the older brands. If it is a concern this might also be an area to address.