Doulton® Kingfisher™ Under Sink Water Filter System with Biotect® Ultra

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 .

Like most of the Doulton range of filters, the Biotect Ultra is made from a cleanable ceramic outer shell for unrivalled filtration, with an activated carbon core to protect against chemical contaminants.

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.

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 Standard 372 – Lead-free compliance

We recommend you check your mains water pressure - ideally you need 30psi/2bar or more. If you do not know what your water pressure you carry out a flow  test on your mains cold water supply to check if your water supply is sufficient for the system to run effectively. You can do yourself at home with a measuring  jug and a timer! 

Steps to check water pressure:

1. Place the jug under your kitchen tap.
2. Turn the cold tap on fully.
3. Start the timer as soon as water begins to flow.
4. Stop the timer when the jug reaches exactly 1 litre.
5. Check how long it took. 

If it took under 6 seconds, you likely have very high pressure (> 10 L/min), which is excellent for Doulton Water Filter Systems but may need to install a pressure reducer to protect your system. 

If it took 7 - 12 seconds, you likely have a medium to low water pressure which should be adequate to run the system. 

If it took anything over 12 seconds, we would not recommend using a Doulton Under Sink Water Filter system without seeking advice on your mains water pressure - ideally you need 30 psi/ 2 bar.  

Do you know where the cold water mains isolator valve is? It is often under your kitchen sink unit, but it is useful to know before arranging a fitting.

Have you got a 3-way tap, or do you need to purchase a Doulton 3-way tap or do you want to keep your existing tap and would like a separate filter tap - again think about this and where the tap is to be fitted then arrange with your plumber.   

However, you may want to explore our British Berkefeld range for an option that requires no plumbing!

Of course we do! Please email filtersales@doulton.com for any help or advice. Alternatively, please call 0333 340 3600.