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Whole of House Filtration Systems

These water filtration systems are designed to filter all of the water entering the home reducing sediment, chemicals, taste and odour. The systems generally filter down to between 5 and 20 microns. Although cartridges are available to filter down to 1 micron it is not normally advised as they will block fairly quickly due to the volume required and the pressure drop across the filters will cause noticeable pressure and flow problems within the house ie water will come out of the taps/shower slower.

It is best to install an undersink water filtration system as well to filter the water to a better quality for drinking. This is only a small volume compared to the volume required for showers, clothes washing, toilets, etc.

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 (averave - 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 Selection

These are two main sizes of water filter, the diameter is the same for both however the length is different, one is 250 mm (10”) long while the other is 500 mm (20”) long. They both take 115 mm (4.5”) diameter cartridges.

The longer 500 mm cartridge is designed for higher flow rate applications, medium to large houses or rural applications where the pump pressure is less than town water. The 250 mm cartridge is best suited to low flow applications; small to medium houses or town water applications where the pressure is higher to push the water through.

Apart from size, the only other difference is single or twin systems. Singles can contain a sediment or carbon filter while twin systems contain a sediment and carbon filter.

Carbon; There are two main types of carbon filter; GAC carbon filters and carbon block filters. For information on the differences between them please see filter cartridges. Essentially GAC filters remove more contaminants but have a greater pressure reduction than carbon block filters and can therefore cause problems in rural or low pressure applications.

Cartridge Selection

Model	Description	Filter Length	Max Suggested Flow Rate (litres/minute)
AS300	Medium Flow Twin System	250 mm	20
AS400	High Flow Twin System	500 mm	30-40
AS350	Medium Flow Single Sediment	250 mm	60
AS425	High Flow Single Carbon	500 mm	30-40
AS450	High Flow Single Sediment	500 mm	60