WaterMark Single Whole House Water Filter System | 20" x 4.5" | Big Blue

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Price: $207.00
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List Price: $247.00
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WaterMark Single Whole House Water Filter System | 20" x 4.5" | Big Blue

WaterMark Certified Whole House Water Filter

This Water Filter System certified to WaterMark Standards AS/NZS 3497 Under the Certificate number 23247.

WaterMark certification is the level of certification required by law for a licensed plumber in Australia to install a water filter system. All products used under this certification will give you peace of mind knowing that your water filter complies with Australian plumbing codes.

Our WaterMark certified filter systems are hand assembled here in Australia and are randomly batch tested to ensure top quality and workmanship for your water filtration products.

Whole House 20" x 4.5" Water Filter System

This filter is designed for Whole House Filtration Up to 90L/Min. Commonly Used as a Filter for Whole House for homes or Utility usage to Laundry as a pre filter.

System Contains:

  • 1x 20" x 4.5" Big Blue Housing
  • 1x Heavy Duty Bracket + Screws
  • 1x Filter Cartridge (Additional Charges Apply)
  • 1x Opening Spanner
  • 1x 1/4" Bung (To Seal Pressure Gauge Hole When Not In Use)

Filter Options


Pure 100% Coconut Carbon Block Water Filters

These filters are rolled to our specifications by Thailand Manufacturers that have been in the industry for more than 30 years. This is TRADE QUALITY 100% COCONUT CARBON. These are the same manufacturers that supply Europe and the US.

Very popular, will fit and suit all 20" x 4.5" Big Blue Housings regardless of brand or colour. This high quality 100% Coconut Carbon filter is the exact filter we use as our front line carbon filter.

As a rule it is difficult to find 100% coconut carbon filters. Most lower priced filters on the market are a blend of coconut carbon and coal based carbon. The problem with coal based carbon is that it has a shorter life and often results in a less palatable flavor.

We use this 100% coconut carbon filter in all of our pre-assembled kits. These are top of the range HIGH QUALITY coconut carbon block filters are ideal for taste and odour issues, and perfect for total extraction of town water chemicals. 

TOP OF THE RANGE 100% coconut carbon, this particular filter is currently supplied throughout the European market as a premium drinking water filter. As the exclusive importer to Australia, we are in a prime position to offer you this high quality filter at rock bottom prices, direct from importer to the public.

The perfect carbon block filter is made from 100% Coconut Shell Carbon, which creates what many believe to be sweetest tasting water. The unique pore structure of this carbon is well suited for chemical absorption, including VOC’s, while reducing chlorine and chemicals that contribute to taste and odour.

0.5 Micron Pure Coconut Carbon Filters

These filters are made with the same high grade Coconut Carbon as our standard range of carbon blocks. These blocks are infused with further additives and different composite materials for specific filtration requirements.

The GT4-19PS5 / 05 (Silver Carbon) Are impregnated with silver ions.

The GT4-19CRC (Chloramine Removal) is a specially designed cartridge for the extraction of the hazardous Chloramine molecule from municipal water supplies.

Chloramine in Water

The introduction of chloramine gas injection sanitation has led to some unforeseen complications both in terms of health impacts and also water filtration. Special Chloramine Removal Composite filters are now necessary to break open the chloramine and once open, absorb it from the water.

Filtration Process

When a cell of bacteria is absorbed into the carbon's structure, it comes into contact with silver ions. The sulphurhydryl group already within the bacterial cell reacts with the silver, producing a silver sulphur complex.  The complex immobilises the respiratory activity of the bacterial cell by preventing the transfer of hydrogen and an oxidative reaction. The cell cannot reproduce and dies, reducing the risk of gastro illness by ingesting bacteria. 


Several factors need to be considered when recommending silver impregnated carbon for use in bacteriostatic filters. Coconut Carbon is rated to be one of the best base materials used in today's market. Coconut Carbon provides a much higher volume of micropores than coal, wood or lignite based carbon. Thus, resulting in a more effective removal of trihalomethanes (THM's) from municipal water supplies. The larger surface area provides a more effective method of filtering common contaminates such as chlorine and chloramines. The unique raw material of the coconut shell and the carbon manufacturing process ensures exceptional hardness and low ash content.