Product comparison · Reverse Osmosis
Aquasure Premier Pro 100 GPD vs Express Water ROELITE9
The Aquasure Premier Pro 100 GPD scores 5.8 and ranks 44th of 69 in Reverse Osmosis; the Express Water ROELITE9 scores 6.1 and ranks 27th of 69 in Reverse Osmosis. The Premier Pro 100 GPD leads on value, the ROELITE9 on build quality.
All 30 Aquasure products 
Aquasure Premier Pro 100 GPD
$240 · 44th of 69 in Reverse Osmosis
- Value — 7 against 5
5.8
6.1
All 24 Express Water products 
Express Water ROELITE9
$307 · 27th of 69 in Reverse Osmosis
- Build Quality — 7 against 6
Across everything we scored, Express Water ROELITE9 sits 0.31 ahead — led by build quality.
Verdict
ROELITE9 ahead · +0.31 (6.1 vs 5.8)Pick the Aquasure Premier Pro 100 GPD when
Value matters7vs5
Ease of installation matters6vs5
Price matters$240vs$307
Pick the Express Water ROELITE9 when
Build quality matters7vs6
You want alkaline remineralization
Where the Aquasure Premier Pro 100 GPD and Express Water ROELITE9 differ
Scores on a 0–10 scale. Each row is one criterion, biggest difference first.
Build Quality
+1 Express WaterEase of Installation
+1 AquasureContaminant Reduction
tiedCertification Coverage
tiedFlow Rate
tiedFilter Life
tiedWarranty & Support
tiedWhat Aquasure Premier Pro 100 GPD and Express Water ROELITE9 owners report
Independent sources, scored for each model. Premier Pro 100 GPD on 5 of five, ROELITE9 on 4.
The Aquasure Premier Pro 100 GPD reading covers its product line; the Express Water ROELITE9 reading covers its product line.
What they say
Aquasure Premier Pro 100 GPD
- Two r/WaterTreatment and r/HomeMaintenance threads cover the Premier RO platform.
- One owner reports 420 ppm TDS at the faucet on a new install, settling to about 360, which is a poor rejection figure and the more relevant of the two for a system sold on membrane capacity; the second describes the Flowlok leak-detection disc deploying during a filter change when a drain-line fitting leaked.
- Nothing addresses the 100 GPD membrane or the LED faucet specifically.
Express Water ROELITE9
- r/HydroHomies concludes Express Water's alkaline filtration does produce alkaline water but that strength drifts over cartridge life, which bears directly on a model sold on five mineral stages.
- Wider r/WaterTreatment threads recommend the platform for taste and value while calling the install involved.
- No thread names the Elite specifically.
The Aquasure Premier Pro 100 GPD reading covers the whole brand; the Express Water ROELITE9 reading covers its product line.
What they say
Aquasure Premier Pro 100 GPD
- Modernize and Quality Water Lab cover Aquasure through the Harmony softeners.
- Dominick Plumbing notes the absence of NSF certification across the brand.
- No third-party review of the Premier RO systems exists.
Express Water ROELITE9
- WaterFilterGuru bench-tested the platform's RO5DX with Tap Score lab analysis at 8.13 overall and measured a remineralisation stage lifting pH to 9.0.
- TapWaterData's certification audit records no certifier listing for the Elite, so its mineral claims rest entirely on Express Water's own data.
YouTube
one side unscoredThe Aquasure Premier Pro 100 GPD reading covers its product line; no usable source for the Express Water ROELITE9.
What they say
Aquasure Premier Pro 100 GPD
- IrixGuy's Adventure Channel, 98,800 subscribers, has two independent owner reviews of the Premier RO - one after several months at 6,100 views and a several-years follow-up - and a separate third-party self-install walkthrough covers the same 4-stage system.
- None names a specific capacity, so this is the Premier line rather than this model.
- The pump configuration is not addressed separately, and the RO roundups that bench-test at this price point do not include Aquasure.
- Brand-level coverage is the Harmony softeners: DIY Homestead Projects at roughly 115,000 views, NKP Home Improvement at roughly 94,000, geminidrums at 15,000 on the fine mesh and IrixGuy's two-year owner review at 13,000.
Express Water ROELITE9
No usable source.
Amazon
+2 Express WaterBoth readings are about these exact models.
What they say
Aquasure Premier Pro 100 GPD
- The Premier Pro 100 GPD reads 4.2 of 5 from 16 ratings on ASIN B07FKCM6T2 - a real pool just above the ten-review floor, and the lowest product-level Amazon figure on any Aquasure system.
- It sits two tenths below the softener line the rest of this brand's Amazon evidence rests on, which is worth saying wherever that figure is used.
Express Water ROELITE9
- The Elite appears in Amazon's own Express Water comparison table at 4.1 from 40 ratings - a real pool above the ten-review floor, and the lowest-rated reverse osmosis system Express Water sells there.
- Every sibling in the same table reads 4.4 to 4.6, so the gap is the finding rather than noise.
Owner reviews
tiedThe Express Water ROELITE9 reading covers its product line.
What they say
Aquasure Premier Pro 100 GPD
- Home Depot reads 4.2 of 5 from 10 reviews on this exact system.
- That is exactly the ten-review floor, so the figure is scorable but should be read as the thinnest usable pool in this brand's set, and the 75 GPD Premier Advanced at 4.5 from 41 is the better-evidenced point of comparison on the same platform.
- Both pools are native, with verified-purchase entries and Aquasure replying under its own support address.
- Across the three Premier configurations Home Depot holds, the ordering runs 4.5, 4.2 and 4.0, which puts this in the middle on a count too small to make that ordering mean much.
Express Water ROELITE9
- Home Depot, Lowe's and Walmart all stock Express Water reverse osmosis systems, and the platform's listings carry their own review files.
- No retailer listing specific to the Elite was found.
Aquasure Premier Pro 100 GPD vs Express Water ROELITE9: pros and cons
What each one does well, and where it falls short.
Pros 5
100 GPD membrane refills the three gallon tank noticeably faster than the 75 GPD version
1.5 to 1 pure-to-drain ratio maintained at the higher output
LED faucet reports filter status without a separate monitor
Quick-connect one-array cartridge design and Flowlok leak protection
Chrome and brushed nickel options at the same price
Cons 6
No system-level NSF certification; the Aquasure listing covers membrane materials and structure only
The LED faucet counts elapsed service rather than measuring water quality
Storage tank is still three gallons, so peak draw is unchanged from the 75 GPD system
One year warranty against five on the softeners
Higher output means the membrane and pre-filters see more throughput between changes
Its Home Depot pool is exactly at the ten-review floor and rates below the 75 GPD model
Pros 5
Five distinct mineralisation stages rather than the single cartridge used elsewhere in the range
0.0001 micron membrane rated at 100 GPD
Heavier build at 24.7 lbs, roughly double the standard chassis
Standard cartridge sizes despite the premium positioning
Leak-detection and quick-connect fittings carried over
Cons 6
Smaller 2.2 gallon tank than the cheaper systems, so it empties faster in use
No published pH range or mineral output despite being sold on mineral content
No NSF listing
Costs more than the 600 GPD tankless Model 6
One-year warranty
Nine cartridges to track and replace
Aquasure Premier Pro 100 GPD vs Express Water ROELITE9: the numbers
Price, scores and rank, then only the specs that differ. Green marks the side with more.
6.1
27th of 69 in Reverse Osmosis
Filtration
Both Carbon Block, Reverse Osmosis, Sediment
Aquasure Premier Pro 100 GPD
Nothing more
Express Water ROELITE9
+ Alkaline Remineralization
Removes
Both Chlorine, Fluoride, Heavy metals, Sediment, TDS, Lead
Aquasure Premier Pro 100 GPDMore
+ PFAS, Taste and Odor, Microplastics, VOCs
Express Water ROELITE9
+ Scale
SpecAquasure Premier Pro 100 GPDExpress Water ROELITE9
DimensionsNot listed18.5 x 14 x 5 in
Weight25 lb (shipping)24.7 lbs
Same on both
- Certifications Not certified
- Flow rate Under 100 GPD
- Filter life 6-12 months
- Warranty 1 Year
- Connection Point of use fitting
- Housing Not specified
- Made in Not stated
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Not sold on either one?
The top-scored and the cheapest other pick from each brand.
More from Aquasure 3 scored in Reverse Osmosis
What’s different
- Nothing we record differs.
Pick it ifValue matters9vs7
More from Express Water 11 scored in Reverse Osmosis
What’s different
- Filtration: adds Granular Activated Carbon
- Certifications: adds NSF/ANSI 58, NSF/ANSI 372
Pick it ifCertification coverage matters7vs2NSF/ANSI 58 only on the RO5DX
What’s different
- Filtration: adds Granular Activated Carbon
- Removes: no Scale
Pick it ifEase of installation matters9vs5
Aquasure Premier Pro 100 GPD vs Express Water ROELITE9: common questions
Is the Aquasure Premier Pro 100 GPD better than the Express Water ROELITE9?
On our scores, the Express Water ROELITE9 is ahead, 6.1 against 5.8. The Express Water ROELITE9 leads on build quality (7 against 6). The Aquasure Premier Pro 100 GPD leads on value (7 against 5) and ease of installation (6 against 5).
Which is cheaper, the Aquasure Premier Pro 100 GPD or the Express Water ROELITE9?
The Aquasure Premier Pro 100 GPD, at $240 against $307: $67 less.
Which removes more contaminants, the Aquasure Premier Pro 100 GPD or the Express Water ROELITE9?
The Aquasure Premier Pro 100 GPD lists 10 and the Express Water ROELITE9 lists 7, with 6 on both lists. Only the Aquasure Premier Pro 100 GPD lists PFAS, Taste and Odor, Microplastics and VOCs.
What do owners say about the Aquasure Premier Pro 100 GPD and the Express Water ROELITE9?
Across 4 independent sources scored for both, the Express Water ROELITE9 is ahead on Reddit, Google and Amazon; Owner reviews is level.
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Scores calculated 16 September 2026 · Products excluded where fewer than two independent sources cover them · How we score