4 Stage Reverse Osmosis Water Filter Replacement Filters Starter Pack

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Get the full set of replacement filters for the Watts 4 Stage Reverse Osmosis Water Filter System

This includes the following filters:

  • 1 x Sediment pre-filter
  • 1 x Activated Carbon pre-filter
  • 1 x 50 GPD membrane
  • 1 x Carbon post-filter

The Watts Flowmatic Sediment filter effectively removes any suspended solids, rust, sand , silt, lead dust and so on.

The Watts Carbon Block filters use coconut carbon filtration technology to maximize the carbon capacity and prevent channelling whilst maintaining a low pressure drop leading to more efficient water filtration.

The filters here are also compatible replacement water filter cartridges for similar 10" filter housings including brands such as Pentek, Ametek, Culligan, Whirlpool and so on. It will fit all under sink water filter housings which use a standard size small 10" x 2.5" filter replacement cartridge.

Compatible with most Standard 4 and 5 Stage Reverse Osmosis Systems, the Watts 50 GPD semi permeable membrane effectively reduces total dissolved solids and sodium, ingredients such as Arsenic, Lead, Percholate, Chromium, Copper, Radium and Protozoan Cysts, such as Giardia and Cryptosporidium.

The final Carbon post-filter provides the final polishing of taste and odour optimisation.

Additional Information

Model 4 Stage Reverse Osmosis Water Filter Replacement Filters Starter Pack
Brand Watts
In Depth Get the full set of replacement filters
Sediment pre-filter,
Carbon pre-filter,
50 GPD membrane,
Carbon post-filter


1 x Sediment Filter - NSF Standard 42 Certified
1 x Carbon Block - NSF Standard 42 Certified

TFC membrane - NSF Standard 42 Certified

1 off carbon in-line - NSF Standard 42 Certified

Watts 10" Coconut Carbon Filter Specifications (WCBCS975):
Micron Rating: 5 micron
Dimensions: 9 3/4" x 2 1/2"
Temperature Range: 50 - 125 F
Max. Operating Pressure: 125 PSIG
Filter Life: About >4000 gallons or 6 months
Filter Media: Extruded coconut shell carbon block
Max. Flow Rate: Approx. 1 gallon per minute (1 GPM)