Before-and-after testing can verify a defined claim only when sampling is controlled.
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 Geological Survey (2023): USGS explains that TDS and salinity depend on the analytical method. A handheld conductivity meter estimates ionic content; it does not identify which ions or non-ionic contaminants are present.
- Water Analytics Australia (2026): WAA describes its benchtop as a no-plumbing unit combining RO, UV, mineral boost, temperature choices and an optional hydrogen-rich mode. These functions should be assessed separately.
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.
Keep the sample, unit and reporting limit together
Start with the property itself. Write the sample point, date, method, unit and laboratory reporting limit beside the result. A kitchen first-draw sample answers a different question from water collected after a two-minute flush. For a treatment check, use matched inlet and outlet samples and the same method. Do not use taste, colour or a TDS pen as a substitute for analysis of a named contaminant.
Where the claim stops
Use the same laboratory method, suitable containers, matched timing and an inlet concentration high enough for a meaningful comparison.
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.
Use condition and service data, not colour alone
One result does not establish cartridge lifetime.
Keep the cartridge code, installation date, clean pressure and estimated volume in one service record. At change time, isolate the water, release pressure, inspect the housing and seal, fit the correct part and recommission according to the product instructions. A clean-looking cartridge may be chemically exhausted; a brown cartridge may still need pressure and volume data to judge its condition.
Measure flow and pressure under the same conditions
Combine laboratory data with volume, pressure and maintenance records for a more defensible performance story.
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.
A practical household check
| Record | What to capture | Why it changes the decision |
|---|---|---|
| Daily use | Count real functions and litres | Removes brochure-only features |
| Space and flow | Check footprint and peak demand | Tests household fit |
| Five-year cost | Include consumables and service | Makes options comparable |
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
- Filtered Tap Water vs Bottled Water: What to Include in a Cost Comparison
- Planning Chloramine Treatment Without Overlooking Flow
- WAA Full Home Water Refining Systems
Common questions
Should I compare products by the number of stages?
No. Compare the household jobs, rated conditions, daily convenience, consumables and support. Two stages with adequate media and contact time can be more useful than a longer list in a small cartridge.
What is the most useful measurement?
Use the measurement that matches the decision. Write the sample point, date, method, unit and laboratory reporting limit beside the result. A kitchen first-draw sample answers a different question from water collected after a two-minute flush. For a treatment check, use matched inlet and outlet samples and the same method. Do not use taste, colour or a TDS pen as a substitute for analysis of a named contaminant.
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 Geological Survey: Salinity and total dissolved solids measurements for natural waters
- Water Analytics Australia: 5-in-1 Hydrogen-Rich Benchtop Water System
- 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.