4 Stage Undersink Reverse Osmosis


  • Removes 96% – 98% Fluoride
  • This premium unit has a 1 litre pure water to 1-1/2 waste ratio and includes Membrane Flushing Service mode to maintain purity
  • Includes 75gpd Dow Filmtec membrane. Installed under the sink this quietly delivers an unlimited supply of pure sparkling Fluoride Free Water.
  • RECOMMENDED – Additional Pi Alkaline Water Filter, to remineralise, alkaline and oxygenate the water for optimum benefits. See Alkaline Water Filters


Reverse Osmosis is the most effective form of filtration removing all contaminants including up to 99% of Aluminum, Asbestos, Fluoride, Iron, Lead, Zinc, Mercury, Calcium, Sodium etc. Micro-organisms including Giardia, Cryptosporidium, Meningitis, Hepatitis, Viruses and Bacteria. Toxic metals and radioactive elements. Pesticides and Herbicides including DDT.

Reverse Osmosis consists of several different stages to remove sediment, chemicals including Chlorine and other contaminants, the reverse osmosis membrane, a storage container for the pure water and a post-carbon post filter.

  • Stage one is a pre-filter to remove any sediment, rust etc.
  • Stage two is a chlorine removal carbon filter as chlorine is detrimental to the cellulose reverse osmosis membrane.
  • Stage three is a Filmtec TFC (Thin Film Composite) ultra-fine membrane that separates the water molecules producing pure water and wastewater.
  • Stage 4 is a polishing carbon for taste with the option of replacing it with our Alkaline or Remineralising option.
  • WASTE COMPONENT – in order to eliminate all minerals and other contaminants, wastewater is generated at Stage 3 when water is forced through the ultra-fine membrane. There are two exits from the membrane, pure water when is then polished through the final filter, and the exit is to eliminate contaminants.  This wastewater is then discharged through a black tube which is normally connected to the under-sink kitchen piping.

Reverse osmosis water is a slow production with water passing through an ultra-fine membrane to separate pure water from wastewater.  Water is produced at approx. 1 litre every 4 – 5 minutes and for this reason some form of water storage is required.  Whilst under-sink models have their own storage tank, portable models require the use of a small storage container, which can be plastic/ glass bottles or fridge containers.

The membrane rejects most of the dissolved substances in the water and allows only purified water to pass through.  The purified water then enters a storage container and the rejected water goes down the drain as waste.

 Unfortunately, Reverse Osmosis cannot be used to treat all the water entering your home for the following reasons.

  1. Waste to pure water ratio. To eliminate filtered contaminants wastewater is produced in the filtration process. All Puregold Reverse osmosis uses 300 litres/day membranes, with a waste component of 1 litre of pure water to 1.5 litres of wastewater.
  2. Slow Production. Puregold incorporates USA made Dow Filmtec Membranes in all portable and under-sink units. At 300 litres a day, 10 – 12 litres an hour or 1 litre every 4 minutes, a storage container is required.  All under-sink reverse osmosis come complete with a stainless steel storage tank, portable units require either a container, either glass bottles or a larger container.

We are often asked about expanding this basic filtration to a 5 – 6 or even 7-stage systems, including 2 carbon filters, which is simply not required and only increases your yearly cartridge change.

We recommend a 4-stage unit, incorporating a sediment pre-filter, carbon pre-filter, membrane and a post-filter.  Any additional stages should be for the addition of minerals and alkalinity to the pure water to ensure energised and remineralised water. For more information on this go to Alkaline Filters

Puregold Reverse Osmosis also include a service or flushing mode, which allows the flushing of any buildup of removed minerals from the membrane to maintain purity.  This is included on all Puregold portable and under-sink models, (not with Kwik Twist Easy Change range).

Available in under-sink models, as well as portable and countertop models.  Ideal for renters or consumers not wanting a permanent installation or when space is limited on the kitchen bench

This heavy duty USA made unit is installed under the sink with its own stainless steel storage tank for unlimited Fluoride Free Water.

This system quietly and automatically produces pure water and shuts off when tank is full without wasting water. The unit comes complete with an 8 or 11 litre stainless steel storage tank, which incorporates a food grade bladder to store the pure water prior to use.
When required, pure water is drawn from the storage tank and receives a final polish from the carbon polishing cartridge just prior to drinking, ensuring only the best tasting, pure drinking water for your good health.

  • US made QMP standard 10″ (9 3/4″) Housings, Independently tested TEST REPORT TT993-B and certified to Australian Standards AS349
  • 75gpd genuine Filmtec TFC membrane providing 300 litres/ day, plenty for a large family!.
  • Pressure gauge to monitor incoming water pressure and cartridge life.
  • Choice of 8 or 11 litre stainless steel water storage tank – TAKES APPROX. 1 -1/2 HOURS TO FILL TANK!
  • 1 -2 micron pre-filter,  1 micron chlorine removal pre-filter and 5 micron inline Coconut Carbon post membrane cartridge.
  • Fully assembled and comes with full installation and service manual and choice of inline / dishwasher and flexible hose installation kit.
  • LOW WASTE – Membrane flushing service mode eliminates contaminant build-up to ensure pure water with a waste ratio of 1 litre of pure water to 1.5 litre of waste.
  • Specifications   –  Unit – 42cms. high x 35 cms. wide x 17cm. deep
    8 litre storage tank 39cms, high x 23cms. diameter
    11 litre storage tank 40cms. high x 26cms. diameter



  % Rejection




  % Rejection


Aluminium    96 – 98 Fluoride  96 – 98
Sodium    92 – 98 Bromide  90 – 95
Magnesium    93-98 Cyanide  93-97
Potassium    92-96 Sulfate  96-99
Calcium    93-99 Thiosulfate  96-98
Manganese    96-98 Silicate  92-95
Iron    96-98 Silica  95-98
Copper    96-99 Nitrate  93-98
Nickel    96-99 Polyphosphate  96-98
Cadmium    93-97 Orthophosphate  96-98
Silver    93-96 Chromate  90-95
Zinc    97-99 Bacteria  >99
Mercury    94-97 Lead  96-98
Hardness    93-97 Arsenic  90-98
Radioactivity    93-97 Medications  97-99
Chloride    92-98 Chlorofoam  71-90
Ammonium    85-90 Tin (11) Sulfate  83-87
PCB’s    97-99 PBA’s  96-98

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