What is the best mains water filter I can get in the UK?
There is a wide variety of mains water filter systems available in the UK.
A whole house water filter or mains water filter is plumbed in to the rising main where water enters your house. They provide you with filtered water in your kitchen and at other taps throughout your house should you want it; for example your bathroom or utility room.
Our mains water filters are suitable for mains water supplies only. If you have a private water supply, your requirements will be different so please take a look at our Private Water filters.
Key Points
- A mains (whole house) water filter is plumbed into the rising main and filters water at every tap in your home, not just the kitchen.
- Mains filters are for mains-supplied properties only - if you're on a private supply you need a different type of filter.
- UK tap water is safe to drink, but standard treatment doesn't remove everything - sediment, chlorine, fluoride, and hardness minerals can all still be present.
- The best filter for you depends on what's bothering you about your water: taste and smell point to a carbon filter like the Moby or Doby, while limescale points to a dedicated hard water filter.
- You don't need to pay for professional water testing to get started - working out what you dislike about your water is usually enough to choose the right filter.
- Cartridges need replacing regularly to keep the filter working - Fountain Filters sends a reminder email every 6 months as a nudge.
Table of contents
What's the Best Mains Water Filter for You?
The BEST one is always determined by what you want to filter out of your mains water.
Despite UK tap water being safe for drinking, cooking and bathing in, not all contaminants are able to be removed.
For example, sediment, chlorine, fluoridation and water hardness could be a concern for you.
Some questions you might want to ask yourself before investing in a mains water filter are:
What is it that you don't like about your water at the moment?
And, is there anything specific that you want to filter out of your water?
You don't necessarily need to pay to have your water professionally tested, but can if you want to.
It could be as simple as just not liking the taste or smell of your water, which is pushing you to keep on filling your supermarket trolley with plastic bottles full of filtered water.
And then you start feeling guilty about adding to the world's plastic pollution crisis. It's a no win situation for you.
Removing Chlorine for Better Taste and Smell
If it is just the taste and smell we'd recommend you install our Moby or Doby mains water filter.
One of these would remove the chlorine for you which would improve the taste and smell of your water.
Removing Limescale from Hard Water
Or, you may be sick and tired of the limescale in your water and be looking for one of our mains water filters for hard water.
We will have a solution for any issues you have with your mains water.
Installing a mains water filter will save you a heck of a lot of money in the long term.
Maintaining Your Mains Water Filter
Remember that when you do install your mains water filter you'll need to maintain that filter by replacing cartridges, cleaning the filter if you're able to, and generally being aware of the quality of the water.
If you notice any sudden changes in the taste and smell of your filtered tap water that may be an indication that you need to replace the filter cartridges. We make this easy for you as we email you every 6 months just to prompt you to think about your water and whether or not you need to change the water filter cartridge.
FAQs
What's the difference between a mains water filter and a private water supply filter? Mains water filters are designed for properties on a public mains supply. If you're on a private water supply (well, borehole, spring, etc.) your requirements are different, so you'll need a filter suited to that instead.
Do I need to get my water professionally tested before choosing a filter? Not necessarily - you can if you want to, but working out what you dislike about your water (taste, smell, limescale) is usually enough to point you to the right filter.
Which filter should I choose if I just don't like the taste or smell of my water? The Moby or Doby mains water filter will remove chlorine, which is usually behind poor taste and smell in tap water.
How do I know when to replace my mains water filter cartridge? Any sudden change in the taste or smell of your filtered water is usually a sign it's time. Fountain Filters also sends a reminder email every 6 months to prompt you to check.
About the author
Louise Allen is a partner at Fountain Filters, where she's helped run the business since 2011. Alongside the day-to-day order management, despatch, and quality, she's built up a practical, hands-on knowledge of water filtration, and reviews the site's articles to keep the advice accurate and genuinely useful. Outside work, she's run the London Marathon with business partner Simon.


