Express Water · Under-sink reverse osmosis
Express Water RO5DX: what it removes and what it costs
The Express Water RO5DX is certified (NSF/ANSI 58) to reduce TDS. Express Water also claims lead, chlorine, fluoride and arsenic from lab tests that are not certification.
1
certified reductions we track
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filters per gallon at rated life
Price checked 2026-10-23. We may earn a commission.
What the Express Water RO5DX removes
"Certified" means a certifier (NSF, WQA, IAPMO or CSA) lists this exact product for that reduction claim; the listing is linked. "Brand test only" means Express Water cites a lab report but no certifier lists the claim. See certified vs. tested.
| Contaminant | Status | Evidence |
|---|---|---|
| TDS | Certified | NSF listing, NSF/ANSI 58 ("TDS") |
| Lead | Brand test only | Express Water (brand claim, no tester named): "Lead" |
| Chlorine | Brand test only | Express Water (brand claim, no tester named): "Chlorine" |
| Fluoride | Brand test only | Express Water (brand claim, no tester named): "Fluoride" |
| Arsenic | Brand test only | Express Water (brand claim, no tester named): "Arsenic" |
| Nitrate | Brand test only | Express Water (brand claim, no tester named): "Nitrates" |
Not verified, either way (no certification or brand claim): PFAS, Chloramine, Chromium 6, Mercury, Microplastics, Cysts, VOCs, Bacteria and viruses, Iron, Copper, Uranium, 1,4-dioxane.
What it costs to run
Yearly cost = replacements per year × filter price, for each filter it uses; a filter is replaced at its gallon rating or its month limit, whichever comes first, plus the water sent to the drain at an average water and sewer price. Water use: drinking and cooking water (0.28 gallons per person a day, EPA's average adult intake).
| Household | Gallons a year | Filters a year | Drain water | Total a year | Per gallon |
|---|---|---|---|---|---|
| 1 person | 102 | — | 310 gal ($7) | — | — |
| 2 people | 204 | — | 619 gal ($13) | — | — |
| 4 people | 409 | — | 1,239 gal ($26) | — | — |
Rated production is 50 gallons a day; 2 people need about 0.56 — well within it. Colder water and lower pressure reduce actual output.
Replacement filters
| Filter | Rated life (gallons) | Rated life (months) | Price |
|---|---|---|---|
| Pre-filter set: SED FLTSED0501, GAC FLTGAC0501, ACB FLTCAR0501 (+ inline PAC) | — | 6 est. Source noteFrom set naming 'No Membrane / 6 Months' expresswater.com | $34.99 Source note |
| FLTMEME50 50 GPD RO membrane | — | — Source noteInterval not stated in text | — Source noteSold in '50 GPD / 1 Year' set at $80.99 with pre-filters expresswater.com |
Specs
- Type
- Under-sink reverse osmosis
- Price
- $190
Source note
Sold as 'RO5DX with free filter set' expresswater.com
- Installation
- DIY (under-sink or inline fittings)
- Rated production
- 50 gallons per day
Source note
Manual spec 50-100 gpd range; RO5DX ships with 50 GPD membrane (FLTMEME50). NSF PDS daily production 12.22 gpd cdn.shopify.com
- Pure to drain
- 0.33:1 est.
Source note
Manual: water discharge '1-3 gallons per gallon produced' (worst case used); PDS efficiency 17.44%, recovery 16.17% cdn.shopify.com
- Tank
- 4 gal
Source note
4 gal tank volume, 3.2 gal water capacity cdn.shopify.com
- Flow rate
- 0.8 gal/min
Source note
Faucet flow rate cdn.shopify.com
- Needs power
- No
- Remineralization
- No
Compare the Express Water RO5DX
Common questions
What does the Express Water RO5DX remove?
The Express Water RO5DX is certified (NSF/ANSI 58) to reduce TDS. Express Water also claims lead, chlorine, fluoride and arsenic from lab tests that are not certification.
Does the Express Water RO5DX remove PFAS?
It has no certifier listing or brand claim for PFAS reduction.
Data checked 2026-10-23. 102 filters tracked.