Whole-house treatment works before water branches through the property, while under-sink treatment serves one drinking-water point.
Evidence snapshot
- NHMRC (2025): The Australian Drinking Water Guidelines are a risk-management framework, not a single national pass/fail law. They separate health-based, aesthetic and operational considerations.
- NSF (2026): NSF standard numbers are not quality rankings. NSF/ANSI 42 covers stated aesthetic claims, 53 health-effect claims, 44 softeners, 55 UV and 58 point-of-use RO; the exact certified claim still has to be checked.
- US EPA WaterSense (2025): Point-of-use RO produces treated permeate and a reject stream. The US EPA's WaterSense work highlights both contaminant performance and water efficiency rather than treating all RO systems as equivalent.
- Water Analytics Australia (2026): WAA's current whole-home page describes staged sediment, carbon and complementary treatment, optional under-sink RO, consultation and ongoing filter support. Exact claims still need to match the supplied configuration.
These figures and standards are reference points, not a diagnosis of one home. Local water data, premises plumbing, flow and maintenance determine how they apply.
What the first observation can tell you
Start with the property itself. Put every quote on the same basis: treatment target, design flow, clean pressure drop, installed plumbing scope, replacement parts and a ten-year service assumption. Stage count is not a performance measure. A smaller system may be the right answer when only drinking water needs treatment; several bathrooms at peak use may justify a different architecture.
Where the claim stops
Reverse osmosis is a treatment process rather than an installation location.
Official guidance describes population-level or supply-level risk; a component test describes stated test conditions; a household observation describes one property. None should silently stand in for another. Connect them only where the source, configuration and operating conditions genuinely match.
Measure flow and pressure under the same conditions
Peak flow, pressure drop and treatment target determine which architecture fits.
Record static pressure and pressure at a known flowing outlet before and after treatment. A shower that feels weak is useful evidence, but it cannot separate a loaded cartridge from a partly closed valve or a wider supply change. Ask for the clean-system pressure drop and the design flow in litres per minute. Repeat the same check after service so the figures are comparable.
What to record before buying
Some households gain from whole-home treatment paired with point-of-use RO.
Decide how the claim will be checked after installation. That may be a pressure reading, service-volume record, alarm status, hardness test or matched laboratory samples. Also write down who acts when the trigger is reached. A result without a maintenance response is not a complete treatment plan.
A practical household check
| Record | What to capture | Why it changes the decision |
|---|---|---|
| Treatment target | Name the substance or household result | Stops stage-count shopping |
| Peak flow | Record simultaneous showers and outlets | Protects pressure and contact time |
| Ownership | Price parts and service for 10 years | Exposes the real cost |
Use the same notes when requesting more than one quote. Suppliers then have to answer the same water, flow and ownership brief rather than redefining the problem around their preferred product.
Where Water Analytics Australia fits
WAA's role is to turn the household brief into a proportionate design. That starts with source water, treatment goal, realistic peak flow, available pressure, installation access and the preferred service approach. Depending on the job, the answer may be whole-home staged treatment, point-of-use RO, the benchtop system or a combination. The written proposal should explain why each stage is present, the conditions behind each claim and what the customer will need to maintain.
Related WAA guides
- What to Include in a Whole-House Water Filter Cost Comparison
- Multi-Stage Whole-House Water Filtration Explained
- WAA Full Home Water Refining Systems
Common questions
What belongs in a comparable quote?
Ask for equipment, plumbing scope, design flow, clean pressure drop, consumables, service labour and the evidence behind each treatment claim. Compare the same ownership period and household peak demand.
What is the most useful measurement?
Use the measurement that matches the decision. Put every quote on the same basis: treatment target, design flow, clean pressure drop, installed plumbing scope, replacement parts and a ten-year service assumption. Stage count is not a performance measure. A smaller system may be the right answer when only drinking water needs treatment; several bathrooms at peak use may justify a different architecture.
What should WAA receive before recommending a system?
Provide the postcode, water source, household size, bathroom count, busiest-use pattern, observed issue, desired result and any laboratory report with its units and sample point.
Sources and further reading
- NHMRC: Australian Drinking Water Guidelines, version 4.0
- NSF: Standards for water treatment systems
- US EPA WaterSense: Point-of-use reverse osmosis systems
- Water Analytics Australia: Full Home Water Refining Systems
The next useful step
Write down the source, the result you want, peak-use flow and the evidence already available. Then ask for a recommendation that gives every stage a defined job, states the operating assumptions and includes the service plan. That is enough detail to compare a WAA proposal with any alternative without relying on fear or brochure language.