The EU directive for nitrate in water supplies is 50 mg/l as No3. Our fully automatic filter systems will reduce nitrates to meet the drinking and production water standards. The EU directive for Arsenic in water supplies is 10 micrograms per litre. Our Bayoxide filters with automatic backwash control will guarantee that your water supply meets the standard. Note : All treatment systems have limitations. Our water quality advisors understand the limitations of filters and will lead you through the process from identification of a problem to a successful treatment outcome.