Whole House Water Filters in Australia: A Buyer’s Guide
A whole house water filter connects to your main water supply line and treats all the water entering your home — every tap, shower, and appliance. Here's a practical guide to choosing the right system for an Australian home.
Browse our whole house filter range or see our full Whole House Water Filters Guide.
Step 1: Know Your Water Source
Town Water
Australian municipal water is treated with chlorine or chloramines and may contain fluoride, sediment, and disinfection by-products. A twin Big Blue system (sediment + carbon) addresses the main concerns for most town water households.
Bore or Tank Water
May contain bacteria, iron, sediment, and other contaminants not present in town water. Requires more comprehensive filtration — typically sediment + carbon + UV sterilisation as a minimum. A water quality test is strongly recommended before choosing a system.
Step 2: Choose the Right System Type
See the full range of whole house systems, sizes, and stages in our whole house filter collection.
| System | Best For | Approx. Cost |
|---|---|---|
| Single stage (sediment or carbon) | Basic pre-filtration | $150–$300 |
| Twin Big Blue (sediment + carbon) | Most Australian town water homes | $300–$600 |
| Triple stage Big Blue | Larger homes, bore/tank water | $500–$900 |
| With UV sterilisation | Bore/tank water with bacteria risk | $800–$2,000 |
Step 3: Check Flow Rate
Flow rate (measured in litres per minute or gallons per minute) determines whether the system can keep up with your household's peak water demand without pressure drop. As a guide:
- 1–2 person household: 30–60 L/min (8–15 GPM)
- 3–4 person household: 60–80 L/min (15–20 GPM)
- 5+ person household: 80+ L/min (20+ GPM)
Big Blue 10" x 4.5" housings handle higher flow rates than slim-line housings and are the standard choice for Australian family homes.
Step 4: Consider Filter Life and Maintenance
Cartridge replacement frequency depends on your water quality and household usage:
- Sediment cartridge: every 2–6 months
- Carbon cartridge: every 4–6 months
- Annual cartridge cost (twin system): approximately $80–$200
Cartridge changes are a straightforward DIY task — no plumber required. See our guide: How to Replace a Water Filter Cartridge. Browse our replacement cartridge range.
Frequently Asked Questions
Do I need a plumber to install a whole house water filter?
For most Australian homes with accessible plumbing, a twin Big Blue system is a manageable DIY installation. See our step-by-step guide: Whole House Water Filter Installation Guide. More complex installations (copper pipe, difficult access) benefit from a licensed plumber.
What size whole house filter do I need?
For most Australian family homes, a 10" x 4.5" Big Blue twin system is the right size. Larger homes or high-sediment water supplies may benefit from 20" housings for longer cartridge life. Call us on 1800 789 781 for a recommendation. You can also browse the full whole house filter range to compare sizes.
How much does a whole house water filter cost in Australia?
System cost ranges from $150 for a basic single-stage unit to $900+ for a triple-stage Big Blue system. See our full breakdown: Whole House Water Filter Cost in Australia.