Express Water · Updated October 2026
Express Water RO5DX: price & specs
Express Water RO5DX. Every price and spec below is linked to its source and dated — no guesses.
Source: expresswater.com verified ✓ corroborated verify in ledger
The Express Water RO5DX is listed at $189.99 on expresswater.com as of 2026-10-20, the cheapest reverse osmosis systems (median $445); other retailers may be lower. It earns a Gold Deskmark — 75/100 pay-blind standing, #2 of 10 in class.
Verified Oct 20, 2026 · figures linked to their source in the table below
Seen at
- expresswater.com$189.99read
Each figure is what that seller's own page published on the day we read it — not our price of record, and not a live quote. Follow the link for what it costs right now.
At Amazon
Amazon.com$167.99sold by Amazon.com(as of — Details)
Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product.
The figure is the featured (buy box) listing at the moment shown, from Amazon's Creators API — not a page we read, and not necessarily the lowest listing.
CERTAIN CONTENT THAT APPEARS ON THIS SITE COMES FROM AMAZON. THIS CONTENT IS PROVIDED 'AS IS' AND IS SUBJECT TO CHANGE OR REMOVAL AT ANY TIME.
Is the Express Water RO5DX a good buy?
At $189.99, the Express Water RO5DX is the cheapest of the 8 reverse osmosis systems we track, where the median is $445. On the spec sheet, its filtration stages of 5 is at the median of the 10, its rated capacity gpd of 50 is at the median of the 7, and its storage tank of 3.2 gal is at the median of the 9.
Specifications
| Price (US) | $189.99 US MSRP $189.99 listed verbatim on the Express Water manufacturer product page (SKU# RO5DX, "$189.99" / data-price-raw="$189.99"). Amazon showed only EUR pricing for German delivery, so the manufacturer USD figure was used. |
|---|---|
| Brand | Express Water |
| Released | — |
| Install type | under-sink |
| Filtration stages | 5 |
| Rated capacity gpd | 50 |
| Pure to drain ratio | — |
| TDS reduction (%) | — |
| Remineralization | No |
| Requires electricity | No |
| Storage tank (gal) | 3.2 |
| NSF certified standards | 58, 372 |
| Membrane life months | — |
| Annual filter cost (USD) | — |
Source: expresswater.com (read 2026-10-20) · corroborated by amazon.com (read 2026-07-11).
How we checked
The Express Water manufacturer product page confirms the exact model (SKU# RO5DX) as a 5-stage under-sink reverse osmosis system priced at $189.99, describing reduction of up to 99.99% of contaminants. The Amazon retailer listing corroborates the identical model in its title ("Express Water RO5DX 5-Stage Under Sink Reverse Osmosis Water Filter System, NSF Certified 372 & 58, 50 GPD") and supplies the 50 GPD rating, NSF 372 & 58 certification ("meet or exceed NSF standard 58"), the "4 gallon (3.2 gallon water capacity) storage tank", and "Operates on 40-80 psi water pressure" (line-pressure, no electricity). Both pages agree this is the base RO5DX (distinct from the RO10DX or alkaline G-series variants); TDS %, membrane-life months, drain ratio, and annual filter cost were not stated by the manufacturer, so they stay blank.
Is the Express Water RO5DX worth it vs cheaper reverse osmosis systems?
Express Water RO5DX against its closest cheaper and pricier reverse osmosis systems on the specs that matter — every value sourced. See all 8 ranked
| Product | Price | Install type | Filtration stages | Rated capacity gpd | Remineralization | Requires electricity |
|---|---|---|---|---|---|---|
| Express Water RO5DX this | $189.99 | under-sink | 5 | 50 | No | No |
| iSpring RCC7AK | $229.99 | under-sink | 6 | 75 | Yes | No |
Frequently asked questions
How much does the Express Water RO5DX cost?
The Express Water RO5DX has a US price of $189.99 (US MSRP $189.99 listed verbatim on the Express Water manufacturer product page (SKU# RO5DX, "$189.99" / data-price-raw="$189.99"). Amazon showed only EUR pricing for German delivery, so the manufacturer USD figure was used.), as of 2026-10-20.
How does the Express Water RO5DX compare on price?
At $189.99, the Express Water RO5DX is the cheapest of the 8 reverse osmosis systems we track, where the median is $445.
What are the Express Water RO5DX's key specs?
Express Water RO5DX (Express Water): Install type under-sink, Filtration stages 5, Rated capacity gpd 50, Storage tank (gal) 3.2, NSF certified standards 58, 372. Full sourced spec sheet verified 2026-10-20.
Price of record: $189.99 at expresswater.com, 2026-10-20. Other retailers may be lower — check the current price:
See it at Amazon.com As an Amazon Associate we earn from qualifying purchases.Similar reverse osmosis systems
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