Here to help : 01352 838281

We recommend you contact us before purchasing one of our hard water filters. This is so we can help you choose the most appropriate filter based on how hard your water is. You may prefer a hard water filter for your whole house, or just the kitchen sink, for example. For a whole house system you need a mains hard water filter.

If you live in an area of the UK with hard to very hard water you may wish to consider one of our OneFlow Hard water filters.

Call 01352 838 281

  • Pearl hard water filter

    Pearl Hard Water Filter

    Tired of limescale and rust build up in your kitchen appliances? Our Pearl hard water filter will sort all that out for you.



  • Inline water filter for home

    Pearl Mini Inline Water Filter

    High performance inline water filter for your home that's ideal for limited space. Choose an inline cartridge that filters out chlorine, improves taste and reduces odour - scale reduction and sediment options available. Includes filter tap (unless oth



  • Pearl OneFlow Hard Water Filter

    Pearl OneFlow Hard Water Filter

    Our Pearl OneFlow is a high performance anti-scale drinking water filter system that prevents scale by transforming dissolved hardness minerals into harmless, inactive microscopic crystal particles.



  • Oyster Taste and OneFlow Hard Water Filter

    Oyster Taste and OneFlow Hard Water Filter

    The Oyster OneFlow removes chlorine and improves the taste and odour of your water. It is also a high performing scale reduction drinking water filter.



What is Hard Water?

It's water that is high in certain minerals. The minerals that contribute to water hardness are calcium and magnesium, mainly in combination with bicarbonate, sulphate and chloride. When hard water is heated above 61 degrees (or as it evaporates) the balance between the dissolved minerals is upset and the bicarbonate converts to carbonate. This is what causes limescale!

Will Hard Water Harm Me?

Hard drinking water is not considered to be harmful to health. It's more of an inconvenience, but it can be resolved by buying and installing either a hard water filter for your drinking water; the Pearl H, or a whole house system such as the Moby H or Moby TH.

What are the Characteristics of Hard Water?

  • Scale and scum formation. For example, either on the surface of the water or round hand basins and baths.
  • Difficulty in getting a soapy lather. This is caused by the calcium in the hard water reacting with soaps and detergents.
  • Formation of limescale on kettles, showers, taps; to name but a few!
  • Formation of limescale deposits inside dishwashers, washing machines, immersion heaters.

Hard Water will Cost you Money

Yes, hard water can cost you money, both in terms of heating costs and having to replace white goods. It can shorten the life of clothing, household appliances such as washing machines and dishwashers, and plumbing such as hoses and pipes; basically anything that hard water comes into contact with.


Hard Water Areas in England & Wales - It's all about the Geography!

Look at the map to see whether you're likely to have hard water. Hardess is measured as the equivalent amount of calcium carbonate in parts per million (mg/l).

Hardness as CaCO3 mg/l Water Hardness Levels
0-50 Soft
51-100 Moderately Soft
101-150 Slightly Hard
151-200 Moderately Hard
201-300 Hard
300- Very Hard


Hard water in England and Wales

The table below lists UK counties with the hardest water.


County Water Hardness Level
Bedfordshire Hard to Very Hard
Berkshire Hard to Very Hard
Buckinghamshire Hard to Very Hard
Cambridgeshire Hard to Very Hard
Dorset Hard to Very Hard
Essex Hard to Very Hard
Gloucestershire Hard to Very Hard
Greater London Moderately Hard
Hampshire Hard to Very Hard
Hertfordshire Hard to Very Hard
Kent Hard to Very Hard
Oxfordshire Hard to Very Hard
Surrey Hard to Very Hard
Sussex Hard to Very Hard
Wiltshire Hard to Very Hard


If you live in Scotland; you're unlikely to have hard water, although does seem to be changing due to increased use of borehole water in the public supply.

Hard Water Filter

A water filter works by forcing the fluid through a medium that has tiny pores. Anything larger than those pores gets stuck while the liquid flows through. Minerals that cause hard water, calcium carbonate and magnesium carbonate (CaCO3 and MgCO3 respectively), are dissolved in the water. That means they don't really have physical dimensions big enough for standard filtration to work.

"Aha, so no filter will work for limescale then", you might say. In the strictest sense that's correct, however; we have filter cartridges that treat and condition those pesky limescale causing minerals by altering their ionisation properties.  This converts them into soft, microscopic crystals that just flow right through your appliances and plumbing.

Those water filter cartrdges fit inside all of our standard water filter housings and so we feel it's fair enough to describe one of these hard water treatment systems as a hard water filter.


We're here to help. Call us on 01352 838 281 if you have any questions about hard water filters.

Read our blog post about hard water HERE

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