Powered by the Doulton Biotect Ultra Ceramic Filter, the Doulton Kingfisher under sink water filter system is our hero product - refined through generations of expertise, designed to sit at the heart of modern homes.
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Backed by Test Data
We take testing seriously. With an in-house team continuously monitoring performance, you can rest-assured that our claims are transparent. The Doulton Kingfisher™ system comes, as standard, with our independently certified Biotect Ultra Filter and is WRAS tested & certified NSF/ANSI Std 42 for Class 1 Particulate & Chlorine reduction & Std 53 for Lead, Turbidity & Cyst reduction (including Giardia and Cryptosporidium) NSF/ANSI Standard 401 for microplastic reduction and NSF/ANSI/CAN Standard 372 (US low lead requirements)
Easy to Install & Maintain
Designed with both convenience and performance in mind, the Doulton Kingfisher fits neatly and discreetly beneath your kitchen sink, helping to maintain a clean and uncluttered space while delivering freshly filtered water directly from your tap. This under sink water filter is designed for quick and hassle-free filter changes without having to turn off your water supply, making ongoing maintenance simple. Engineered for reliable, high-performance filtration, the Kingfisher provides peace of mind for your whole family effortlessly every day.
Manufactured in Staffordshire
Doulton is proud to be a Made in Britain brand. For 200 years, every ceramic filter element has been crafted in England and is now based at our manufacturing facilities in the heart of Staffordshire’s historic Potteries, where each one is carefully quality-checked by our in-house experts at every stage of production. This advanced process ensures exceptional quality and maintains 'The Doulton Standard' in every drop of your drinking water.
FAQs
What Independent test certification does the Doulton Kingfisher with Biotect Ultra Filter have?
What Independent test certification does the Doulton Kingfisher with Biotect Ultra Filter have?
Tested and certified by NSF International and WRAS, the system meets:
- WRAS requirements
- NSF/ANSI Standard 42 – Material Safety, class 1 particulate and chlorine reduction
- NSF/ANSI Standard 53 – Turbidity, cyst and lead reduction
- NSF/ANSI Standard 401 – Microplastic reduction
- NSF/ANSI/CAN Standard 372 – Lead-free compliance
Do I need to use a Doulton 3-Way Tap or Doulton Pillar Tap with my Doulton under sink water filter system?
Do I need to use a Doulton 3-Way Tap or Doulton Pillar Tap with my Doulton under sink water filter system?
You do need a separate tap or 3-way tap to dispense your filtered water without worry of cross contamination with unfiltered water and we strongly recommend using a tap from the Doulton range with your under sink water filter system. Our taps go through strict quality control and sourcing processes to ensure reliability and performance. More importantly, they are specifically designed to work seamlessly with Doulton under sink systems, helping to maintain proper water pressure and flow rate without complications and worries of cross contamination. Many third-party taps use a ¼” inlet feed pipe, which is not ideal for Doulton systems and can result in reduced water flow. In contrast, Doulton taps use a 3/8” connection, which is engineered to maintain optimal flow when used with our under sink water filter systems.For the best performance and to avoid potential flow issues, we recommend choosing a Doulton tap and very closely following the installation and conditioning instructions supplied with the ceramic filter - to ensure that the filters are fully wetted and avoid any trapped air within the systems .
Can I use other filters in the Kingfisher system?
Can I use other filters in the Kingfisher system?
We only recommend using Doulton Filters within the Doulton systems. If you are looking to protect against scale deposition in addition to bacteria and cysts, insecticides, herbicides, microplastics, heavy metals and chlorine, we recommend the Biotect Ultra SI instead of the Biotect Ultra.

