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Doby Taste and Fluoride Filter

Improve taste and odour while removing fluoride from your mains water.



Product SKU: PRAA341



Fluoride and Taste, Odour, Chemicals, and Sediment whole house filtration with this double Doby setup - removes fluoride and improves taste and odour while also removing chemicals and sediment from your mains water supply.

When fitting allow for a minimum of H 72cm x W 60cm x D 18cm.

Your kit will include:

  • 2 x big blue filter housing
  • 1 x white housing bracket
  • 1 x 5 micron activated carbon block cartridge (Watts WCBFF20). 
  • 1 x Activated Alumina cartridge for fluoride reduction
  • Either 1/2 for 15mm or 3/4 for 22mm ports
  • 2 x Isolating flexis (no need for extra ball valves)
  • 1 x double check valve - either 15mm or 22mm
  • 1 x housing spanner
  • Fitting instructions for your plumber

Cartridge details:

  • Watts WCBFF20 coconut shell carbon block filter cartridge for chlorine, taste, odour and sediment reduction.
  • 5 micron / 4.5 x 10"
  • Outperforms GAC cartridges as it has superior chlorine reduction (up to 99%), lower pressure drop, will not channel and costs less than a GAC cartridge.
  • Media wrap between centre tube and carbon block to reduce carbon fines.
  • 100% coconut shell carbon.
  • FDA grade components and materials.
  • Recommended  max flow rate - 25 Lpm / 7 gpm
  • Maximum operating pressure: 125 PSIG
  • Operating temperature: 10°C - 52°C / 50°F - 125°F
  • Chlorine reduction - >220,000 litres / 55,000 Gal @ 20 litres per minute / 4 gpm.
  • Tested and certified under NSF / ANSI standard 42 for materials only.

Please note that on the occasions where we do not have the Watts WCBFF20 in stock another compatible high quality cartridge may be used in the kit.


  • 1 x 4.5'' x 20" activated alumina fluoride removal filter cartridge
  • 10 micron
  • Temperature range 40°F (4°C) to 100°F (38°C)
  • Pressure range 25 psi (1.7 bar) to 100 psi (6.9 bar)
  • Capacity 10,000 mg/l
  • Flow rate - 15 lpm / 3 gpm
  • Reduction ability - 10ppm to <0.2ppm (93% reduction)

What order do the cartridges go in?

In most circumstances the lowest micron rated cartridge goes last in the sequence (on the water out side). For the Doby Taste and Fluoride mains water filter the 5 micron carbon block cartridge goes first in the sequence, followed by the 10 micron activated alumina cartridge.

Do you have to install a mains water filter under the sink?

No, you don't. You can install your mains water filter wherever the cold water supply enters your house. This could be a utility room, garage, or other location.


* Watts components are sometimes replaced with other similar quality items due to supply chain issues. Brassware and other plumbing accessories are sourced from UK suppliers.

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