Certification Coverage
+5 Express Wateronly the Aquasure Premier Advanced 75 GPD: Not certified; only the Express Water RO5DX: NSF/ANSI 58, NSF/ANSI 372.
Product comparison · Reverse Osmosis
Aquasure Premier Advanced 75 GPD vs Express Water RO5DX
The Aquasure Premier Advanced 75 GPD scores 6.1 and ranks 26th of 69 in Reverse Osmosis; the Express Water RO5DX scores 7.1 and ranks 5th of 69 in Reverse Osmosis. The Premier Advanced 75 GPD leads on ease of installation, the RO5DX on certification coverage.
All 30 Aquasure products 
Aquasure Premier Advanced 75 GPD
$190 · 26th of 69 in Reverse Osmosis
- Ease of Installation — 6 against 5
6.1
7.1
All 24 Express Water products 
Express Water RO5DX
$190 · 5th of 69 in Reverse Osmosis
- Certification Coverage — 7 against 2
Across everything we scored, Express Water RO5DX sits 1.00 ahead — led by certification coverage.
Verdict
RO5DX ahead · +1.00 (7.1 vs 6.1)Pick the Aquasure Premier Advanced 75 GPD when
Ease of installation matters6vs5
Pick the Express Water RO5DX when
Certification coverage matters7vs2NSF/ANSI 58 only on the RO5DX
Build quality matters7vs6
You want granular activated carbon
Where the Aquasure Premier Advanced 75 GPD and Express Water RO5DX 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
tiedFlow Rate
tiedFilter Life
tiedWarranty & Support
tiedValue
tiedWhat Aquasure Premier Advanced 75 GPD and Express Water RO5DX owners report
Independent sources, scored for each model. Premier Advanced 75 GPD on 5 of five, RO5DX on 5.
Both readings are about these exact models.
What they say
Aquasure Premier Advanced 75 GPD
- Two r/WaterTreatment and r/HomeMaintenance threads cover this exact system.
- One owner reports installing the Premier and measuring 420 ppm TDS at the RO faucet, falling to about 360, which is a poor rejection figure and drew a run of diagnostic replies.
- The second describes the Flowlok leak-detection disc deploying during a filter change when a drain-line restrictor fitting leaked, which reads as the safety feature working rather than a defect.
- Beyond those, Aquasure discussion in the subreddit is about the softeners, and the general view of budget under-sink RO there is sceptical about wastewater and mineral removal rather than about this brand.
Express Water RO5DX
- r/WaterTreatment names the RO5DX directly for taste and value, and one owner reports incoming TDS of 600-800 falling to the low teens through it.
- The recurring complaints are mechanical rather than filtration: O-rings weeping at the housings, a faucet spigot leaking on a system inherited at two years old, and an install repeatedly described as more involved than rivals. r/Homebrewing is the dissenting thread, with commenters calling the output unpleasant to taste.
The Aquasure Premier Advanced 75 GPD reading covers the whole brand.
What they say
Aquasure Premier Advanced 75 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 RO5DX
- WaterFilterGuru bench-tested this model with Tap Score lab analysis and scored it 8.13 overall - 8.40 on health-related contaminants, 8.50 on aesthetic - rating component quality outstanding and certification exceptional, while marking setup weak and criticising the pure-to-drain ratio and recovery rate.
- The Spruce tested it hands-on for its 2026 reverse osmosis roundup.
- TapWaterData confirms the NSF listing covers TDS alone against marketing claiming 158 impurities.
YouTube
+1 AquasureThe Aquasure Premier Advanced 75 GPD reading covers its product line.
What they say
Aquasure Premier Advanced 75 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 under-sink RO roundups that bench-test at this price point still do not include Aquasure, so there is owner evidence but no independent testing.
- 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 RO5DX
- An independent tester who lab-tests every system in the category tested the RO5DX and left it off the final list, singling it out for needing three full tank flushes before the water is usable - longer than any other conventional RO compared.
- Hands-on install videos are positive on taste and upkeep, but the two with the largest audiences carry affiliate codes or a sponsorship disclosure and are not weighted.
Amazon
+2 Express WaterBoth readings are about these exact models.
What they say
Aquasure Premier Advanced 75 GPD
- The Premier 75 GPD RO reads 4.4 of 5 from roughly 276 ratings, seen on two separate storefront reads at a matching $179.99.
- The brushed nickel and extra-output variants carry their own ASINs with no ratings on them, so this figure belongs to the chrome system rather than to a shared file.
Express Water RO5DX
- ASIN B00J2DGTD8 reads 4.6 from 6,157 ratings, distributed 80 percent five-star, 11 four, 4 three, 1 two and 4 one - the largest single pool in this catalogue - and holds Amazon's Choice in Under-Sink and Countertop Filtration.
- Faucet finishes carry separate ASINs with separate counts, so this describes the RO5DX rather than the line.
Owner reviews
tiedBoth readings are about these exact models.
What they say
Aquasure Premier Advanced 75 GPD
- Home Depot reads 4.5 of 5 from 41 reviews on the brushed nickel version of this system, which is the identical hardware with a different faucet finish.
- The pool is native, with verified-purchase entries and Aquasure replying under its own support address, and at 41 reviews it is comfortably above the ten-review floor and the deepest product-level retailer pool on any Aquasure RO.
- The rest of the Premier range sits lower at the same retailer, 4.2 from 10 on the 100 GPD Pro and 4.0 from 8 on the alkaline version, so this is the best-reviewed of them rather than a figure that carries across the line.
Express Water RO5DX
- Walmart lists this system at 4.8 from 282 reviews and Home Depot stocks it as internet #307338516 with its own review file.
- Home Depot, Lowe's, Walmart and Amazon all stock Express Water.
- Walmart's 4.4 from 56 is the seller rating, not a product pool, and is excluded.
Aquasure Premier Advanced 75 GPD vs Express Water RO5DX: pros and cons
What each one does well, and where it falls short.
Pros 5
1.5 to 1 pure-to-drain ratio, better than most tank RO systems at this price
Lead-free designer faucet, tank and full cartridge set all included
Quick-connect one-array cartridge design makes replacement fast
Flowlok leak protection works: an owner reports the sacrificial disc catching a drain-line leak during a filter change
Home Depot rates the brushed nickel version 4.5 of 5 across 41 reviews
Cons 6
No system-level NSF certification: the only Aquasure listing covers membrane materials and structure, not performance
The 99 percent contaminant reduction claim has no published test report behind it
75 GPD with a three gallon tank means slow recovery for heavy drinking-water use
One year warranty against five on the softeners
Pre and post filters need changing every six to twelve months
One owner measured 420 ppm TDS at the faucet on a new install, settling to 360, which is high for an RO system
Pros 6
Listed by NSF under NSF/ANSI 58 for TDS reduction, verifiable in the public database
Meets the lead-free content requirement of the US Safe Drinking Water Act
Ships with a spare pre and post filter set covering the first six months
Standard 10 inch cartridge sizes, so replacements are not proprietary
Leak-detection pad shuts off the feed line automatically
Independently bench-tested at 8.13 overall by WaterFilterGuru
Cons 6
Certification covers TDS reduction only - lead, fluoride, arsenic and PFAS claims rest on the membrane and the brand's own lab data
50 GPD is slow against 400-600 GPD tankless systems at similar money
Discharges one to three gallons to drain for every gallon produced
4-gallon tank plus five housings needs most of a sink cabinet
Warranty is one year, against three to five from several direct competitors
Needs 40-80 PSI; below that a booster pump is an extra purchase
Aquasure Premier Advanced 75 GPD vs Express Water RO5DX: the numbers
Price, scores and rank, then only the specs that differ. Green marks the side with more.
6.1
26th of 69 in Reverse Osmosis
7.1
5th of 69 in Reverse Osmosis
Filtration
Both Carbon Block, Reverse Osmosis, Sediment
Aquasure Premier Advanced 75 GPD
Nothing more
Express Water RO5DX
+ Granular Activated Carbon
Removes
Both Chlorine, Fluoride, Heavy metals, Sediment, TDS, Lead
Aquasure Premier Advanced 75 GPDMore
+ PFAS, Taste and Odor, Microplastics, VOCs
Express Water RO5DX
+ Arsenic, Calcium, Nitrate
Certifications
Aquasure Premier Advanced 75 GPD
Not certified
Express Water RO5DXMore
NSF/ANSI 58, NSF/ANSI 372
SpecAquasure Premier Advanced 75 GPDExpress Water RO5DX
DimensionsNot listed17 x 15 x 5 in
Weight21 lb (shipping)12.8 lbs
Same on both
- 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
- Filtration: adds Alkaline Remineralization
- Removes: adds Low pH
Pick it ifYou want alkaline remineralization
More from Express Water 11 scored in Reverse Osmosis
What’s different
- Filtration: adds UV
- Certifications: none listed
Pick it ifEase of installation matters9vs5
What’s different
- Certifications: none listed
- Removes: no Arsenic, Calcium +1 more
Pick it ifEase of installation matters9vs5
Aquasure Premier Advanced 75 GPD vs Express Water RO5DX: common questions
Is the Aquasure Premier Advanced 75 GPD better than the Express Water RO5DX?
On our scores, the Express Water RO5DX is ahead, 7.1 against 6.1. The Express Water RO5DX leads on certification coverage (7 against 2) and build quality (7 against 6). The Aquasure Premier Advanced 75 GPD leads on ease of installation (6 against 5).
Which has more certifications, the Aquasure Premier Advanced 75 GPD or the Express Water RO5DX?
The Express Water RO5DX. The Aquasure Premier Advanced 75 GPD lists none; the Express Water RO5DX lists NSF/ANSI 58 and NSF/ANSI 372.
Which removes more contaminants, the Aquasure Premier Advanced 75 GPD or the Express Water RO5DX?
The Aquasure Premier Advanced 75 GPD lists 10 and the Express Water RO5DX lists 9, with 6 on both lists. Only the Aquasure Premier Advanced 75 GPD lists PFAS, Taste and Odor, Microplastics and VOCs.
What do owners say about the Aquasure Premier Advanced 75 GPD and the Express Water RO5DX?
Across 5 independent sources scored for both, the Aquasure Premier Advanced 75 GPD is ahead on YouTube; the Express Water RO5DX 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