Whole House Filter Systems

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Single,Twin or Triple system

The systems come in single filter, twin filter or triple filter configuration. Single systems are used if you only want to remove sediment and are happy with the taste and smell of the water or if you only want to remove chemicals, chlorine, taste, odour or tannins from water that has very little sediment or dirt. Twin systems are the most popular and designed to remove sediment and chemicals, chlorine, taste, odour, tannins etc. Triple systems remove sediment and chemicals like twin systems with an additional cartridge to remove more sediment down to 5 or 1 micron before Ultra-Violet (UV) systems or an additional specialised filter to remove Iron, lead, chloramines etc.

System Filter Size: 10″ (250mm) or 20″ (500mm)

The size of the filter housing depends upon the flow rate or amount of water you need to be filtered, the water pressure in the house (pressure your pump is able to produce) and the water quality. We generally recommend the 10″ housings for town water applications or small rural homes and the 20″ housings for large rural homes. The diameter is the same for both filter sizes, the length however is either 10″ (250mm) or 20″ (500mm) long. They both take 115mm (4.5″) diameter cartridges.

Big White or Big Blue System

The units size wise are essentially exactly the same, they have the same pressure rating and the cartridges fit both units. The Big White housings are much stronger though, built from a harder more dense material than the Big Blue units hence we offer a 10 year warranty with the Big White and a 3 year warranty with the Big Blue. The Big Blue are more popular due to price. If kept out of the weather and used in rural applications the Big Blue units should last as long as the Big White however we would recommend Big White units for town water or higher pressure applications.

Filter Flow Rates

Standard Big Blue and Big White filters have 1″ or 25mm inlet and outlet sizes that are designed for flow rates of up to 60 litres per minute with a sediment cartridge or 30 litres per minute with a carbon cartridge (to provide the contact time required for contaminate removal). Filters with a 1.5″ or 40mm inlet and outlet can have flow rates up to 170 litres per minute with a sediment cartridge. Flow rates this high are not advised with 25mm inlet/ outlets due to excessive pressure loss.

Household Water Requirements

Household daily water requirements vary from house to house and state to state however the average house uses 800 litres/day with the average person using 275 litres per person per day. This includes drinking, showers, toilets, clothes washing, cooking, etc. The following tables are a guide to the amount of water required by household appliances and fixtures and the total volume that can be used.
Household Water Requirements (average - modern appliances)
Showers 9-15 lpm (litres per minute)
Kitchen Tap 9 lpm 13-15 litres/sink fill
Diswasher 5 lpm 18-40 litres/cycle
Washing Machine 19 lpm 60-150 litres/load
Toilet 10 lpm 9/4.5 litres/flush
1/2" Tap 35 lpm
3/4" Tap 60 lpm
The estimated water requirements for the household can be added together to help guide selection of the correct filter.

Filter Stages and Cartridge Selection

First Filter (Stage 1)

The first filter or stage is a sediment filter to remove suspended contaminants from the water such as dirt, rust, bugs etc. These are generally available in 1, 5, 10, 20 & 50 micron rating. The lower the micron rating, the more contaminants removed. The majority of systems are supplied with 20 micron sediment filters although 5 micron is also popular.

Sediment Filters

There are three types of sediment filters available; polyspun, pleated and bag. Polyspun Sediment Filters Polyspun sediment filters remove more contaminants due to the depth or thickness of the filter but have a higher pressure loss through the filter. Pleated Sediment Filters Pleated sediment filters remove less contaminants but have a much bigger surface area, (5-10 times polyspun filters) a low pressure loss through the filter and can be partially cleaned to give them a longer life; filter cartridge can be removed and hosed to remove some of the contaminants although this can weaken the pleated material and is not successful with 1 micron cartridges. Bag Sediment Filters Bag filters are a low cost alternative with the down sides of both polyspun and pleated filters; a small surface area and no depth of filtration. They are available along with carbon impregnated bags but not recommended.  

Second Filter (Stage 2)

The second filter or stage is a carbon filter to remove chlorine, THM's, VOC's, chemicals, pesticides, herbicides, insecticides, taste, odour, colour & tannins. They are generally available in 0.5, 5 & 10 micron. The majority of systems are supplied with a 10 micron carbon filter although the 0.5 micron is common for town water applications.

Carbon Filters

Carbon Filters are available in a carbon block, GAC (Granular Activated Carbon) and refillable cartridges. Carbon block filters have a large surface area to trap sediment and remove contaminants and are recommended for rural applications where pressure is a problem. The water however only travels through a few centimetres of media from the outside of the cartridge to the inside therefore the contact time and contaminant removal is not a high as factory assembled GAC cartridges. GAC Cartridges GAC cartridges have a small sediment filter at the end of the cartridge to trap and remove contaminants and should therefore always be used with a sediment pre-filter. Water travels through over 45cm of media, from one end of the cartridge to the other giving a long contact time and high contaminant removal. The pressure loss or drop is much higher through these cartridges that can cause problems in rural applications. Refillable Cartridges Refillable cartridges are not recommend (although we carry them in stock) for 2 reasons; (1) we have had a number of customers with opposition systems where the refillable cartridge has ruptured emptying the carbon into the house pipe work, valves, hot water systems etc costing them thousands of dollars to fix. (2) When a GAC cartridge is packed by machine, a precise amount carbon is added to the cartridge to allow for expansion when water is run through it. The sediment pads are also welded in place keeping the media firmly in place. This cannot be done when the media is paced by hand resulting in either too much media risking rupture or too little causing the water to track down the inside of the cartridge instead of through the media.  

Recommended Maximum System Flow Rates (1″ Inlet & Outlet)

Filter System Filter Length Max Suggested Flow Rate (litres/minute)
10″ Big Blue/ White Twin System 250 mm 20
20″ Big Blue/ White Twin System 500 mm 30
10″ Big Blue/ White Single Sediment 250 mm 40-60
10″ Big Blue/ White Single Carbon 250 mm 20
20″ Big Blue/ White Single Sediment 500 mm 60

Whole of House Systems List

Single Systems

Twin Systems

Triple Systems

AS350 10″ Big White Single Sediment Filter AS300 10″ Big White Twin System AS500 20″ Big White Triple System
AS355 10″ Big Blue Single Sediment Filter AS305 10″ Big Blue Twin System AS505 20″ Big Blue Triple System
AS450 20″ Big White Single Sediment Filter AS400 20″ Big White Twin System
AS455 20″ Big Blue Single Sediment Filter AS405 20″ Big Blue Twin System
AS425 20″ Big White Single Carbon Filter
AS430 20″ Big Blue Single Carbon Filter

These large water filter systems are designed to filter all of the water going into the house, removing sediment, dirt, chlorine, chemicals, taste, odour, tannins etc. They are generally used in town water applications to remove the chlorine from water saving on the need for multiple filters for showers and drinking water or in rural applications to filter tank water for the house.

An additional undersink water filtration system is usually installed in rural applications to filter the water to a better quality for drinking and cooking. Customers can build their own single, twin or triple whole of house system and select filter cartridges to suit their individual application.