The Water Filter World Twin 20" Big Blue Whole Home Water Filter System is a large-format dual-stage filtration system designed for point-of-entry installation on the incoming household water supply.
This basic-grade configuration combines a 20" × 4.5" sediment cartridge with a 10 micron carbon cartridge, providing separate treatment stages for suspended sediment, chlorine, unwanted taste, colour and odour.
Water Filter World specifies the system for larger households and higher water use, including homes with two or more bathrooms. The current assembly also includes dual pressure gauges, brass ports and a heavy-duty mounting bracket.
The first cartridge captures suspended dirt, rust, sand, silt and similar particulate material before water reaches the carbon stage.
The second stage uses WFW's basic-grade 10 micron carbon cartridge for chlorine, unwanted taste, colour and odour treatment.
The Twin 20 system is designed for central filtration rather than treatment at one individual drinking tap.
Once installed on the incoming water line, water passes through both large-format cartridges before continuing to applicable taps, showers and connected appliances downstream of the filtration point.
The system does not automatically include scale-control or ultraviolet treatment. Those functions require separate or alternative system configurations.
The first Big Blue housing contains the sediment cartridge.
This stage provides mechanical filtration before the water reaches the carbon cartridge.
Captures suspended dirt from the incoming water supply.
Helps reduce particulate rust before downstream filtration.
Provides physical filtration for suspended sand and similar particles.
Reduces suspended silt within the operating range of the installed cartridge.
Uses Water Filter World's 20" × 4.5" Big Blue cartridge format.
The sediment cartridge is a consumable component that requires periodic replacement.
Water Filter World's current replacement range includes several large-format sediment cartridges for whole-house systems.
Use the cartridge specified for your purchased configuration rather than changing micron rating without considering source-water conditions and pressure drop.
The standard basic-grade Twin 20 system uses a 10 micron carbon cartridge in the second housing.
Water Filter World lists this stage for treatment of chlorine, unwanted taste, colour and odour.
Provides chlorine reduction within the operating capacity of the supplied carbon cartridge.
Carbon treatment can reduce unwanted taste in applicable incoming water.
WFW also lists colour and unwanted odour reduction for its basic-grade carbon configuration.
Water Filter World currently offers both basic-grade and high-grade Twin Big Blue configurations.
| Feature | Basic Grade | High Grade |
|---|---|---|
| Carbon Rating | 10 micron | 0.5 micron |
| Chlorine Treatment | Yes | Yes |
| Taste, Colour & Odour | Yes | Yes |
| Giardia & Cryptosporidium Cyst Reduction | Not listed for the basic cartridge | Listed by WFW for the high-grade cartridge |
| Lead / Heavy Metals | Not listed for the basic cartridge | Listed by WFW for the high-grade cartridge |
Water Filter World lists several construction features for its current Twin Big Blue system.
WFW states that the filtration assembly uses 100% BPA-free plastics.
The current Big Blue housings are listed by the manufacturer as UV stabilised.
Water Filter World lists a 90 PSI burst-pressure rating for the Twin Big Blue filtration assembly.
The current manufacturer package includes solid brass connection ports.
Two gauges are supplied to assist with monitoring system pressure and filter restriction.
A heavy-duty mounting bracket forms part of the current system package.
Water Filter World states that the current Twin Big Blue Basic Grade system is tested and approved under the Australian WaterMark scheme.
This is relevant to permanent plumbing installation because WaterMark requirements apply to regulated plumbing products used in Australia.
The final installation should still be completed in accordance with applicable plumbing requirements and any site-specific conditions.
Water Filter World states that its current whole-house systems are hand built and pressure tested in Sydney using American, British and Australian components.
The manufacturer also states that system components are independently tested.
This does not change the need to select the correct cartridge media and have the installed system operated within its specified plumbing conditions.
Allow additional room below and around the system for pipework, housing removal and future cartridge servicing.
Water Filter World identifies the standard Twin Big Blue system as suitable for under-cover installation without a stainless steel protective cover.
The manufacturer separately offers Twin Big Blue versions supplied with a stainless steel cover and stand for outdoor installation.
The current WFW Twin Big Blue package includes two pressure gauges.
Monitoring pressure through the filtration assembly can help identify increasing restriction as cartridges collect sediment or approach the end of their practical service life.
A pressure change should be considered alongside household flow, cartridge age and incoming pressure rather than used as the only maintenance indicator.
The standard basic-grade system should not be described as a universal water-treatment solution.
The sediment and basic carbon combination can suit applications where particulate material, chlorine, unwanted taste, colour or odour are the main treatment requirements.
Sediment filtration can form part of a tank-water installation, but UV or other treatment may also be required depending on the intended use and water conditions.
These sources can require additional settling, pre-treatment, testing or specialist filtration before a Twin Big Blue system is suitable.
The large 20" × 4.5" format supports whole-house applications, but the final usable flow depends on more than the physical housing size.
| Specification | Detail |
|---|---|
| Brand | Water Filter World / WFW |
| Application | Whole-house / point-of-entry filtration |
| Housing Configuration | Twin 20" × 4.5" Big Blue |
| Stage 1 | Sediment filtration |
| Stage 2 | 10 micron basic-grade carbon filtration |
| Carbon Treatment | Chlorine, unwanted taste, colour and odour |
| Pressure Gauges | 2 included |
| Ports | Brass ports |
| Mounting | Heavy-duty bracket included |
| Plastics | WFW states 100% BPA-free |
| Housing Treatment | UV stabilised |
| Listed Burst Pressure | 90 PSI |
| WaterMark | Manufacturer states Australian WaterMark approved |
| Dimensions | Approx. 700 mm H × 400 mm W × 200 mm D |
| Installation Environment | Standard uncovered version suits under-cover installation |
| UV Treatment | Not included in this standard configuration |
| Scale Control | Not included in this standard configuration |
The Twin 20 Big Blue is a serviceable filtration system and should not be treated as maintenance-free.
Replace according to sediment loading, pressure drop, water use and the specification of the installed sediment cartridge.
Replace according to water usage, chlorine-treatment demand and the rated service life of the carbon cartridge.
Inspect O-rings and sealing surfaces whenever the filter housings are opened for maintenance.
Order the Water Filter World Twin 20 Big Blue for delivery to supported Australian locations where you already have a suitable installer.
Choose the standard 10 micron carbon configuration where its listed chlorine, taste, colour and odour treatment suits the application.
Professional installation may be available in eligible Brisbane and Gold Coast service areas, subject to property access and plumbing requirements.
The system uses two large-format 20" × 4.5" filter housings.
The current basic-grade WFW package includes Twin Big Blue housings, sediment filtration, a 10 micron basic-grade carbon cartridge, dual pressure gauges, brass ports and a heavy-duty mounting bracket.
Water Filter World lists chlorine, unwanted taste, colour and odour treatment for the basic-grade carbon cartridge.
Yes. The current basic-grade Twin Big Blue system is listed with a 10 micron carbon cartridge.
Yes. Water Filter World currently supplies a 20" × 4.5" 5 micron sediment cartridge, along with washable 5 micron and 20 micron alternatives.
Yes. The current manufacturer package includes two pressure gauges.
Yes. Water Filter World lists solid brass ports on the current Twin Big Blue assembly.
Water Filter World states that the current Twin Big Blue Basic Grade system is Australian WaterMark approved.
WFW lists the current filtration assembly with a 90 PSI burst-pressure rating.
Yes. Water Filter World lists its current Big Blue housings as UV stabilised.
Water Filter World states that the filtration assembly uses 100% BPA-free plastics.
Approximately 700 mm high × 400 mm wide × 200 mm deep.
No. This standard Twin 20 Big Blue product does not include a UV treatment stage.
No. Scale-control treatment requires a separate AntiScale configuration.
The standard uncovered system is listed by WFW for under-cover installation. A separate version with stainless steel cover and stand is available for outdoor installation.
Yes. Water Filter World also offers a separate high-grade Twin Big Blue configuration using a 0.5 micron carbon cartridge with additional manufacturer-listed treatment capabilities.
Purchase the WFW Twin 20 Big Blue without installation where you already have a suitable installer or maintenance arrangement.
The sediment and basic-grade carbon stages are described separately without adding unsupported health, purity, scale-control or contaminant-removal claims.
Installed Today can also support eligible local installations where the plumbing, system sizing and site access are suitable.
The Water Filter World Twin 20" Big Blue Whole Home Water Filter System is designed for households wanting central sediment and carbon filtration using two large 20" × 4.5" housings.
The current basic-grade configuration includes sediment filtration followed by a 10 micron carbon stage for chlorine, unwanted taste, colour and odour treatment, together with dual pressure gauges, brass ports and a heavy-duty mounting bracket. WFW also lists BPA-free plastics, UV-stabilised housings, a 90 PSI burst rating and Australian WaterMark approval for the current system.
Before ordering, confirm the sediment cartridge you want, that the basic 10 micron carbon stage provides the treatment you require, and that your installation location is suitably protected. If you require UV treatment, scale control or the additional treatment functions of WFW's 0.5 micron high-grade carbon cartridge, choose the corresponding system configuration rather than assuming those functions are included in the standard Twin 20 package.
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Same Day Delivery: Available in Brisbane and Gold Coast on select units ordered before 8:00am
Express Delivery: 1–4 business days
Standard Delivery: 2–8 business days
Same day delivery is available for selected hot water systems in Brisbane and Gold Coast metro areas when ordered before 8:00am, subject to stock availability, delivery capacity and suitable transport conditions.
Most hot water orders in metro areas are delivered quickly, with around 90% arriving within 1 business day.
Hot water systems cannot always be transported safely by courier during rain. Delivery timeframes may be affected when wet weather impacts safe handling, loading, unloading or transport conditions.
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