EcoHero 4-Stage vs 5-Stage Reverse Osmosis: Which Do You Actually Need?
Both the EcoHero 4-Stage and 5-Stage RO systems use an identical EcoHero-50 membrane — the same 0.0001-micron filtration, the same NSF 58 certification, the same WaterMark AS3497 compliance. The difference between the two is a single pre-filtration stage, not a membrane upgrade. For most Australian households on treated city mains water, the 4-Stage delivers the same output water quality as the 5-Stage at $50-$100 less. This guide explains exactly what the 5th stage adds, when it matters, and which model suits your water supply and household.
Quick Verdict
4-Stage for city mains water. 5-Stage for tank water, rural supply, or high sediment areas.
Both systems share the EcoHero-50 membrane — fluoride removal 93-97%, lead 98-99%, TDS reduction 90%+, NSF 58 and WaterMark certified. The 5-Stage adds an extra pre-filter that protects the membrane under higher sediment or turbidity loads. For Brisbane, Sydney, Melbourne, Perth and Adelaide mains water, the 4-Stage is the better value. The 5-Stage is justified for acreage tank water, older infrastructure, or areas with known sediment issues.
What is the EcoHero RO System?
The EcoHero range is made by Pure Water Systems Australia, a Brisbane-based company that designs and sells water filtration equipment directly to Australian households. All EcoHero under-sink systems use the EcoHero-50 membrane — a 0.0001-micron reverse osmosis membrane with NSF 58 certification and WaterMark AS3497 compliance. That WaterMark certification matters in Australia: it means the system meets Australian/New Zealand Standard AS3497 for water filtration and is recognised by licensed plumbers as compliant for installation under your sink.
The EcoHero-50 membrane claims 300% improved water efficiency compared to standard RO membranes of the same class — meaning for every litre of filtered water produced, less is rejected as waste water. Running cost is approximately 3-5 cents per litre of filtered output, which stacks up well against bottled water at $1-4 per litre.
The range covers under-sink and portable variants, with optional remineraliser stages. For this comparison, the focus is on the two most popular models: the 4-Stage Under Sink and the 5-Stage Under Sink.
EcoHero 4-Stage Under Sink: Specs and Performance
| Specification | EcoHero 4-Stage Under Sink |
|---|---|
| Price | $959 — $1,009 AUD |
| Filtration stages | 4 (PP sediment, carbon block, EcoHero-50 RO membrane, GAC post-filter) |
| Membrane | EcoHero-50, 0.0001 micron |
| Fluoride removal | ~93.6% |
| Lead removal | ~98.6% |
| Arsenic removal | ~88% |
| TDS reduction | ~90.8%+ |
| Water efficiency | 300% better than standard RO membranes |
| Certifications | NSF 58, WaterMark AS3497 |
| Running cost | ~3-5 cents per litre |
| Best for | City mains water (Brisbane, Sydney, Melbourne, Perth, Adelaide) |
The 4-Stage removes all the contaminants that matter for Australian households: fluoride (added to all major city supplies), chloramine (used in Brisbane, Sydney, Perth, Adelaide, Darwin instead of free chlorine), PFAS, lead, arsenic, and TDS. The 4-stage configuration runs: polypropylene sediment pre-filter to catch particles and sediment, a compressed carbon block to remove chlorine and chloramine before the membrane, the EcoHero-50 RO membrane itself, then a GAC post-filter to polish taste and remove any residual odour from the storage path.
For households connected to treated mains water in any Australian capital city, this is sufficient. City water is low-turbidity and consistently within ADWG parameters before it reaches your tap. The pre-filtration load on the 4-Stage membrane is manageable.
See EcoHero 4-Stage current pricing →
EcoHero 5-Stage: What the Extra Stage Actually Adds
| Specification | EcoHero 5-Stage Under Sink |
|---|---|
| Price | $1,009 — $1,059 AUD |
| Filtration stages | 5 (extra pre-filter stage + same 4-stage core) |
| Membrane | EcoHero-50, 0.0001 micron (identical to 4-Stage) |
| Fluoride removal | ~93-97% (same membrane = same rejection rate) |
| Lead removal | ~98-99% (same membrane) |
| TDS reduction | ~90.8%+ (same membrane) |
| Water efficiency | 300% better than standard RO membranes |
| Certifications | NSF 58, WaterMark AS3497 |
| Running cost | ~3-5 cents per litre |
| Best for | Tank water, rural supply, high-turbidity or sediment-heavy sources |
The 5th stage is an additional pre-filtration step — not a membrane upgrade. The EcoHero-50 membrane is identical in both systems. What the 5th stage does is add another layer of mechanical filtration before water reaches the membrane, catching finer sediment particles and reducing the pre-filtration load on the carbon block stage.
This matters when your water supply has variable turbidity or higher sediment loads — tank water, bore water, rural town supplies, or older reticulated infrastructure where sediment events are more frequent. Under those conditions, the extra pre-filter stage extends membrane life and maintains performance consistency. For low-turbidity city mains water, the 4-stage pre-filtration is already adequate and the extra stage makes no practical difference to the water you drink.
See EcoHero 5-Stage current pricing →
4-Stage vs 5-Stage: Side-by-Side Comparison
| Feature | 4-Stage | 5-Stage |
|---|---|---|
| Price (under-sink) | $959 — $1,009 | $1,009 — $1,059 |
| Filtration stages | 4 | 5 |
| Membrane model | EcoHero-50 | EcoHero-50 (same) |
| Fluoride removal | ~93.6% | ~93-97% |
| Lead removal | ~98.6% | ~98-99% |
| TDS reduction | ~90.8%+ | ~90.8%+ |
| NSF 58 | Yes | Yes |
| WaterMark AS3497 | Yes | Yes |
| Water efficiency | 300% vs standard | 300% vs standard |
| Running cost | 3-5 cents/L | 3-5 cents/L |
| Best for | City mains water | Tank/rural/high-sediment |
Pure Water Systems EcoHero RO
See full under-sink filter comparison →Who Should Buy the 4-Stage?
The 4-Stage is the right choice for the majority of Australian households. If you are connected to treated mains water in any capital city or large regional centre, the pre-filtration load on the 4-Stage is well within its design range. You are getting the same EcoHero-50 membrane and the same contaminant rejection at $50-$100 less.
Specifically, the 4-Stage is the practical choice if you are:
- On Brisbane, Sydney, Melbourne, Perth, Adelaide or Darwin city mains supply
- A 1-4 person household with average water consumption
- Primarily concerned with fluoride, chloramine, PFAS, and lead removal
- Budget-conscious and want the best membrane performance per dollar
- Installing in a new build or renovation with standard mains connection
The 4-Stage also comes in a portable variant ($595-$645) for renters who cannot install under-sink. Same EcoHero-50 membrane, wall-mountable, no plumbing required, 15-litre output bottle. See the 4-Stage Portable →
Who Should Buy the 5-Stage?
The 5-Stage earns its extra $50-$100 in specific circumstances where the extra pre-filtration stage provides genuine membrane protection:
- Tank water (rainwater collection) — sediment and particulate loads are higher and more variable
- Bore or dam water — turbidity can spike after rain events
- Rural town supplies where reticulation infrastructure is older
- Adelaide, where water hardness (~140 mg/L CaCO3) and higher TDS (~400 ppm) place greater demand on pre-filters
- Households with 5+ people where membrane throughput is higher
- Anyone who wants the extra pre-filtration as insurance and is comfortable paying the small premium
See EcoHero 5-Stage current pricing →
What About the Portable Versions?
Both systems come in portable variants designed for renters and those without plumbing access. The portable units use the same EcoHero-50 membrane and carry the same NSF 58 and WaterMark certifications — WaterMark on a portable unit is uncommon and is a genuine differentiator against competing portable RO products on the Australian market.
- 4-Stage Portable: $595-$645 — wall-mountable or benchtop, 15L bottle, no plumbing
- 5-Stage Portable: $695-$745 — same design, extra pre-filter stage for variable water quality
For Brisbane and Sydney renters who want fluoride and chloramine removal without a plumber: the 4-Stage Portable is the entry point. The 5-Stage Portable makes more sense for renters in older buildings or those on tank/bore supply where water quality is less consistent.
What About the Remineraliser Add-On?
Both 4-Stage and 5-Stage are available with an optional remineraliser stage that adds calcium and magnesium back to RO-purified water, raising the pH slightly to ~7.5-8.0. RO removes ~90-97% of dissolved minerals (TDS drops from 100-400 ppm down to under 20 ppm). Remineralisation improves taste — pure RO water can taste flat — and provides trace minerals.
The remineraliser is a taste and mineral-content preference, not a filtration upgrade. If you find RO water too flat and want trace calcium and magnesium back, it is a reasonable addition. If you are primarily motivated by contaminant removal, the standard 4-Stage or 5-Stage delivers that without the added cost.
Australian City Guide: Which Model for Your Water?
| City | Disinfection | Hardness | Recommended |
|---|---|---|---|
| Brisbane / SEQ | Chloramine | Moderate (80-120 mg/L) | 4-Stage |
| Sydney | Chloramine | Moderate-soft (~50-80 mg/L) | 4-Stage |
| Melbourne | Free chlorine | Very soft (~25 mg/L, TDS ~60) | 4-Stage |
| Perth | Chloramine | Hard (~180 mg/L, TDS ~170) | 4-Stage or 5-Stage |
| Adelaide | Chloramine | Hard (~140 mg/L, TDS ~400) | 5-Stage (higher TDS load) |
| Rural / tank water | Variable | Variable | 5-Stage |
One point that affects filter choice more than stage count: if you are in Brisbane, Sydney, Perth, Adelaide or Darwin, your water utility uses chloramine rather than free chlorine as the disinfectant. Standard GAC carbon filters — including Brita and most pitcher-style filters — remove free chlorine effectively but are largely ineffective against chloramine. RO removes chloramine ahead of the membrane via the compressed carbon block stage. This is the core reason RO is the appropriate choice for drinking water in chloramine cities, regardless of whether you choose 4 or 5 stages.
Frequently Asked Questions
Is the EcoHero 5-Stage better than the 4-Stage for drinking water quality?
No. Both systems use the identical EcoHero-50 RO membrane (NSF 58 certified). The output water quality is the same. The 5-Stage adds an extra pre-filter that protects the membrane from sediment damage — it does not improve the membrane’s contaminant rejection rate. Fluoride, lead, PFAS, and TDS removal are determined by the membrane, not the stage count.
What does the 5th stage actually add?
An additional pre-filtration stage — typically a secondary polypropylene sediment or fine-mesh pre-filter — that catches smaller particles before water reaches the carbon block and membrane. This extends membrane life under higher-turbidity conditions (tank water, rural supply, older reticulation infrastructure). For city mains water, the 4-Stage pre-filtration is already adequate and the extra stage provides no practical benefit.
Can I upgrade from 4-Stage to 5-Stage later?
No — these are different housing configurations. If you want 5-Stage filtration you would need to purchase the 5-Stage system. Given the small price difference ($50-$100), if you have any uncertainty about your water source quality, buying the 5-Stage upfront is the more practical decision.
Does EcoHero remove fluoride?
Yes. The EcoHero-50 RO membrane removes approximately 93.6% of fluoride (4-Stage figures). This is consistent with NSF 58 certification standards for RO membranes. Carbon filters — including catalytic carbon block filters — cannot remove fluoride. Only reverse osmosis and activated alumina remove fluoride from drinking water at household scale.
Do I need a plumber to install EcoHero under-sink?
Yes for the under-sink models. WaterMark AS3497 certification means the system is designed for permanent plumbed installation by a licensed plumber. Installation typically adds $150-$250 to the total cost. If you want to avoid plumbing costs, the portable variants (4-Stage Portable at $595 or 5-Stage Portable at $695) require no plumbing and can be wall-mounted or placed on a benchtop.
What is the running cost per litre?
Approximately 3-5 cents per litre of filtered output, based on Pure Water Systems’ stated figures for cartridge replacement and the EcoHero-50 membrane’s efficiency rating. This compares to $1-4 per litre for bottled water. Annualised cost depends on household consumption and local water pressure, which affects waste-to-product ratio.
How does EcoHero compare to Waterdrop or AquaTru?
EcoHero under-sink models have WaterMark AS3497 certification (an Australian plumbing standard) that most imported under-sink RO brands do not carry. The EcoHero-50 membrane claims 300% better water efficiency than standard RO membranes. AquaTru is a countertop RO with no plumbing required — a different install category. Waterdrop X8 is a direct competitor in the under-sink category; confirm WaterMark status before comparing. A full comparison is covered in our EcoHero 5-Stage review.
Does EcoHero have WaterMark certification?
Yes. Both the 4-Stage and 5-Stage Under Sink systems carry WaterMark AS3497 certification — the Australian Standard for water filtration products intended for plumbed installation. This certification is required by licensed plumbers for permanent under-sink installation and confirms the product meets Australian materials and performance standards. It is a meaningful differentiator against imported RO systems sold in Australia without this certification.
Shop Pure Water Systems EcoHero RO
NSF 58 certified, WaterMark AS3497, EcoHero-50 membrane with 300% better water efficiency than standard RO. Ships from Australia with local warranty.
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Former Royal Australian Navy Clearance Diver and TAG-E counter-terrorism operator. Founded Clean and Native to apply the same rigorous thinking to the home environment.
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