Compare bottled-water spending with the full cost of filtered tap water over the same period: equipment, installation, scheduled cartridges, servicing and relevant energy and water costs. Use your household’s actual usage and prices.
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 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.
Use condition and service data, not colour alone
Start with the property itself. 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.
Where the claim stops
A fair household comparison uses litres actually consumed and a multi-year period.
Compare daily use and ownership, not feature count. Include bench or plant space, peak demand, reject water where relevant, temperature capacity, consumables, cleaning and support. Price the same period for every option. A feature that duplicates an existing appliance or creates an awkward maintenance routine may have little practical value.
The operating detail that changes the answer
It should also consider convenience and waste without claiming that every bottled product or every tap supply has the same composition.
Check the conditions that can move the result: flow, pressure, temperature, water chemistry, media quantity, treated volume and time since service. A technology can be well suited in principle and still be undersized or poorly maintained in practice. Put the relevant operating range into the proposal.
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
- One 5-in-1 Benchtop System vs Separate Purifier, Kettle, Chiller and Hydrogen Device
- Before-and-After Water Testing: How to Prove a Filtration System’s Performance
- 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. Compare daily use and ownership, not feature count. Include bench or plant space, peak demand, reject water where relevant, temperature capacity, consumables, cleaning and support. Price the same period for every option. A feature that duplicates an existing appliance or creates an awkward maintenance routine may have little practical value.
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: 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.