Whole House Filter | 2 Stage | 20" x 4.5" | Big Blue | Twin
SKU: EA-WF-WH-02
Ships free Australia-wide. Delivered by Allied Express or Aramex bulky freight, 3–10 business days depending on state.
Free Click & Collect from our Wyong NSW showroom (in stock for immediate pickup).
Same-day dispatch on orders before 12pm AEST.
In stock.In stock · ships from Wyong, NSW
Order today for fast dispatch
14-day returns on damaged or faulty items — returns policy
Questions? Call (02) 8772 8162 Mon–Thu 9am–3pm
- Stages
- 2
- Cartridge format
- Big Blue 20" × 4.5"
- Housings
- Twin
- Spare cartridges included
- Yes (extra set)
Specifications
- System type
- Twin Big Blue whole-house filter, 2-stage
- Stages
- 2
- Stage 1
- Sediment filter
- Stage 2
- Carbon filter
- Cartridge format
- Big Blue 20" × 4.5"
- Housings
- Twin Big Blue with mounting bracket
- Includes
- Bracket + starter cartridges + extra spare cartridge set
- Installation
- Wall-mount, point of entry
- Cartridge replacement interval
- 6–12 months
A twin-housing Big Blue 20" × 4.5" whole-house filter system in 2-stage configuration — the value-priced way to get full Big Blue cartridge size on a whole-house install, supplied with the initial cartridge set plus an extra spare set so the first cartridge change is already in the cupboard.
What's in the Package
- Twin Big Blue 20" × 4.5" filter housings
- Mounting bracket
- Starter cartridge set (sediment + carbon)
- Extra replacement cartridge set included — covers the first service interval out of the box
Two-Stage Filtration
The 2-stage configuration handles the two contaminant categories that matter most for whole-house filtration: sediment (silt, dirt, sand, rust) and chlorine + chemical contaminants. Each cartridge is 20" × 4.5" Big Blue format — significantly larger surface area than the slimmer 20" × 2.5" format, meaning:
- Higher flow capacity — handles peak demand events (multiple showers + dishwasher + washing machine running simultaneously) without pressure drop
- Longer cartridge life between replacements — bigger media volume to load with sediment and adsorb chemicals
For most Australian family homes on municipal water, 2-stage Big Blue treatment covers everything that needs treating at the whole-house level.
When 2-Stage Big Blue Is the Right Choice
- Family homes on municipal water wanting sediment and chlorine reduction at every tap, without the cost of 3-stage premium systems
- Owners who service their own filters — the included spare cartridge set means the first service is already accounted for
- Properties needing more flow capacity than 10" × 4.5" or 20" × 2.5" formats can deliver
Step Up When
If you need an additional carbon stage for heavier chlorine reduction, longer service intervals, or finer polishing, look at the premium 3-stage Big Blue system. If your installation requires WaterMark certification, the Big Blue WaterMark 3-stage system is the certified option.
Installation
Professional installation recommended. Connects to cold mains supply line at the point of entry. Big Blue housings carry the full whole-house flow without restriction.
Key features
- Twin Big Blue 20" × 4.5" filter housings with mounting bracket
- 2-stage filtration: sediment + carbon
- Starter cartridge set plus an extra spare replacement set included
- Big Blue 20" × 4.5" cartridge format — high flow, long cartridge life
- Removes silt, dirt, sand, rust, chlorine, pesticides, and chemicals
- Mid-range Big Blue at $299.95
- Protects appliances, hot water heater, and washing machine from sediment
Recommended for
- Family homes wanting Big Blue filtration at mid-range pricing
- Owners who service their own filters and want the spare set included
- Properties on chlorinated municipal water or moderate tank-water sediment
- Replacement of an older or smaller-format whole-house system
Compliance & certification
Whole-house filter system — not subject to WaterMark certification as a downstream-of-meter point-of-entry product.
Ready to order?
Order before 12:00pm AEST on a business day for same-day dispatch from Wyong NSW. See shipping details.
Frequently bought together
More whole house
What customers say
5.0 from 74 customer reviews
- Google
“Excellent service and outstanding products. I purchased a 900mm bathroom vanity with stoneware top and chrome tap and am very happy with the customer service provided by Adam. The bathroom vanity looks great. I would highly recommend this business.”
- Google
“I had an issue with my caravan water filtration and the guys at Enviro Aqua got me sorted with a new system that is far better than my old one and for less than the cost of the previous filters alone. If you have to replace filters in your caravan, look here first.”
Australian-owned
Real Wyong NSW warehouse and showroom. ABN 24 638 197 734. Proper tax invoices on every order.
Same-day dispatch
Orders placed before 12pm AEST on a business day ship the same day from Wyong. Tracked Australia-wide.
No proprietary lock-in
Standard 10" and 20" Australian housings. Buy replacement cartridges from any supplier.
Whole House Filter | 2 Stage | 20" x 4.5" | Big Blue | Twin
$299.95 AUD