Choosing between a whole house and under sink water filter is one of the most common questions homeowners ask in Australia.
Both options improve water quality — but they serve very different purposes.
👉 Choosing the wrong system can mean you’re only solving part of the problem.
This guide breaks down the differences so you can make the right decision for your home.
Not sure which system is right for you?
👉 Book a Free Water Quality Assessment
What Is an Under Sink Water Filter?
An under sink water filter is installed beneath your kitchen sink and filters water at a single tap.
Best for:
- Drinking water
- Cooking
- Improving taste and odour
Benefits:
✔ Lower upfront cost
✔ Compact and hidden
✔ Easy to install
Limitations:
❌ Only filters one tap
❌ Doesn’t improve water for showers, laundry, or appliances
👉 This is a point-of-use solution, not a whole-home solution.
What Is a Whole House Water Filter?
A whole house water filtration system is installed at the main water entry point, filtering all water entering your home.
Best for:
- Full home water quality improvement
- Showers, laundry, and appliances
- Long-term water protection
Benefits:
✔ Filters every tap in the house
✔ Reduces chlorine exposure in showers
✔ Protects plumbing and appliances
✔ Improves overall water quality
👉 This is a complete water solution.
Want clean water from every tap?
👉 Explore Whole-Home Filtration Options
Key Differences at a Glance
| Feature | Under Sink Filter | Whole House Filter |
|---|---|---|
| Coverage | One tap | Entire home |
| Installation | Simple | Professional install |
| Cost | Lower upfront | Higher upfront |
| Protection | Drinking water only | Full home |
| Appliance protection | ❌ | ✔ |
Which One Is Better?
👉 The answer depends on your goal.
Choose Under Sink if:
- You only want better drinking water
- You’re renting or on a tight budget
- You want a simple solution
Choose Whole House if:
- You want clean water everywhere
- You care about skin, hair, and shower quality
- You want to protect appliances and plumbing
- You’re thinking long-term
👉 Most homeowners upgrading their home choose whole-house systems for complete coverage.
What About PFAS and Contaminants?
If you’re concerned about PFAS or other contaminants:
- Under sink systems can treat drinking water
- Whole house systems provide broader protection
Research shows that activated carbon filtration and membrane-based technologies (such as reverse osmosis) are effective at reducing PFAS concentrations in drinking water (Rahman, Peldszus, and Anderson 2014; U.S. EPA 2023).
👉 The best approach depends on your water quality and system design.
The Biggest Mistake Homeowners Make
The most common mistake is choosing a system based on price alone.
👉 This often results in:
- Partial filtration
- Ongoing water issues
- Upgrading again later
Studies on household water treatment highlight that system selection must align with specific contaminants and usage requirements to be effective (World Health Organization 2022).
Get the Right Water Filtration System for Your Home
Every home’s water is different — your solution should be too.
👉 Book Your Free Water Assessment Today
- Understand your water quality
- Get tailored system recommendations
- Improve water across your entire home
Final Thoughts
Both under sink and whole house filters have their place in Australia homes.
👉 The key is understanding what you actually need.
If you want a simple upgrade, under sink may be enough.
If you want a complete solution — whole house filtration is the clear choice.
📚 REFERENCES
U.S. Environmental Protection Agency. 2023. PFAS Explained.
World Health Organization. 2022. Guidelines for Drinking-water Quality, 4th ed.
Australian Government Department of Health. 2023. Drinking Water and Health.
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