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Doby TMF Filter

Taste, heavy metals and fluoride mains water filter. With full fitting instructions and free UK standard delivery.



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Fluoride, Metals and taste, odour, chemicals and sediment (TOCS) filtration with this double Doby mains water filter system.

Stage one removes fluoride then stage two filters metals and improves taste and odour while also removing chemicals from your cold water tap supply.

Your kit will include:

  • 2 x 20 inch big blue filter housings
  • 1 x white double housing bracket
  • 1 x 4.5 x 20" GAC cartridge for removal of heavy metals and chemicals and to improve taste and odour of your mains water.  
  • 1 x 4.5 x 20" 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:

  • 1 x 4.5'' x 20" activated alumina fluoride removal filter cartridge
  • 20 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)


  • 1 x 4.5 x 20" canister containing GAC/KDF filter medium (GAC10N/KDF-BOM)
  • 5 micron
  • 24,000 gallons @ 2.0gpm or 12 months; whichever comes first
  • Certified NSF/ANSI standard 42 NSF
  • Certified by ISO 9001
  • Performance tested and verified by independent laboratory testing

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.

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