Here to help : 01352 838281

Below you'll find replacement water filter cartridges for our Moby and Doby mains water filters. 

If you can't find the water filter cartridge you're looking for then either call us on 01352 838 281 or send us a message through our help desk

We recommend you change the o-ring every couple of years, so if you haven't changed it recently just select o-rings from the drop down menu on each product below. See below for 'Why do I need to change the o-ring?'

Free standard postage for all deliveries within the UK. 

You can put used cartridges in your household recycling bin.

  • Moby TF fluoride filter cartridges

    Moby TF Water Filter Cartridges

    Replacement water filter cartridges for our Moby TF.

    132.49 ex VAT)
    £158.99

    Quantity:

  • Moby TBC replacement cartridges

    Moby TBC Water Filter Cartridges

    Water filter replacement cartridges for our Moby TBC which removes bacteria and chemicals from your water.

    163.335 ex VAT)
    £195.99

    Quantity:

  • Moby TM Replacement Water Filter Cartridges

    Moby TM Replacement Water Filter Cartridges

    Improve taste and odour and remove chlorine, sediment and heavy metals from your mains water.

    110.835 ex VAT)
    £132.99

    Quantity:

  • Moby TMF Cartridge Set

    Moby TMF Cartridge Set

    Water filter replacement cartridges for our Moby TMF. A taste, metals and fluoride mains water filter.

    168.335 ex VAT)
    £201.99

    Quantity:

  • Moby H replacement cartridge

    Moby Hard Water Filter Cartridge

    Water filter replacement cartridge for the Moby H.

    44.16 ex VAT)
    £52.99

    Quantity:

  • Moby F replacement cartridge

    New Moby F Cartridge

    Replacement Watts water filter cartridge for our Moby F.

    97.49 ex VAT)
    £116.99

    Quantity:

  • Doby 20 x 4.5

    4.5 x 20 inch Carbon Block Water Filter Cartridge

    5 micron carbon block water filter cartridge for a 20 inch housing.

    54.99 ex VAT)
    £65.99

    Quantity:

  • Moby Cartridge

    4.5 x 10 inch Carbon Block Water Filter Cartridge

    5 Micron Carbon Block cartridge for our Moby mains water filter.

    39.16 ex VAT)
    £46.99

    Quantity:

  • MAXCL-FF-975 Chlorine Guzzler

    C-Max MAXCL-FF975 Water Filter Cartridge

    Green top Full Flow Chlorine Guzzler 4.5 x 10 inch cartridge for Big Blue housings

    55.83 ex VAT)
    £66.99

    Quantity:

  • New Moby M Cartridge

    Moby M Water Filter Cartridge

    Replacement water filter cartridge for our Moby M taste and metals mains water filter.

    75.83 ex VAT)
    £90.99

    Quantity:

  • Iron Reduction Cartridge 4.5'' x 20''

    Iron Reduction Cartridge 4.5'' x 20''

    Water filter replacement cartridge for iron reduction. Free UK delivery.

    Please enquire for availability - 01352 838 281
  • Doulton Rio Candles - no carousel

    Moby Rio 6 Doulton Replacement Candles

    Set of 6 Doulton Sterasyl candles for the Moby Rio - without carousel (plenum).

    99.99 ex VAT)
    £119.99

    Quantity:

  • New Moby Rio Carousel

    New Moby Doulton Rio Carousel

    Replacement Carousel with 6 candles for the Moby Rio

    119.16 ex VAT)
    £142.99

    Quantity:

  • 2.5 x 10 inch Carbon Block Water Filter Cartridge

    2.5 x 20 inch 10 Micron Carbon Block Water Filter Cartridge

    10 micron carbon block water filter cartridge for a 20 inch housing.

    43.33 ex VAT)
    £51.99

    Quantity:

  • Replacement filter cartridge for Doby M

    Doby M Replacement Cartridge

    Replacement water filter cartridge for our Doby M taste and metals mains water filter.

    148.33 ex VAT)
    £177.99

    Quantity:

  • Doby Taste and Fluoride Water Filter Cartridges

    Doby Taste and Fluoride Water Filter Cartridges

    Replacement water filter cartridges for our Doby Taste and Fluoride Filter

    237.49 ex VAT)
    £284.99

    Quantity:

  • Doby TMF Filter Cartridges

    Doby TMF Filter Cartridges

    Replacement water filter cartridges for our Doby TMF Filter

    330.83 ex VAT)
    £397.00

    Quantity:

  • Doby Fluoride Filter Cartridge

    Doby Fluoride Filter Cartridge

    Replacement water filter cartridge for our Doby Fluoride Filter

    191.66 ex VAT)
    £229.99

    Quantity:

Why do I need to change the o-ring?

You can tell if the seals start leaking, which is obvious, we know.

Even if there are no leaks you may find that the profile of the O ring becomes flattened because of prolonged time under compression. The cross section should be round and if it's not it may not seal easily.

However, we recommend that you replace the O rings every two or three years as a precautionary measure.

One of the main reasons for changing O rings periodically is that as they age and compress, the housing bowl needs to be tightened excessively. That leads to difficulty loosening the bowl from the cap next time the cartridge needs to be replaced.

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