Express Water RO5DX
#6 in With tankFull review
For a budget buyer who wants a certified system with cheap filters. Anyone paying for water or on a septic system should pick a lower waste design.
Amazon $179.99$179.99
3.5/5
For buyers who want a certified tank RO system with remineralization at a low price and can accept high water waste.
- 75 gallons a dayOutput
- $133 a yearFilters
- YesNSF/ANSI 58
Check price at Amazon$189.99
Price checked November 2, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Adds calcium back for a less flat taste
- Certified to NSF/ANSI 58 by WQA
- Needs no outlet under the sink
Cons
- Wasted about five gallons per gallon made in independent testing
- Mineral and pre-filters every six months push filter costs above $130 a year
- Amazon lists it for later shipment, so the APEC store may be the quicker source
The APEC ROES family
Every APEC ROES model we rank, smallest first. Ratings compare each against its own type.
| Model | Output | Rating | Price |
|---|---|---|---|
| APEC ROES-50 | 50 gallons a day | 3.6/5 | $179.99 |
| APEC ROES-PH75 (this one) | 75 gallons a day | 3.5/5 | $189.99 |
| APEC ROES-100 | 100 gallons a day | 4.0/5 | $199.99 |
How it scores
The rating comes from 6 measured or published factors, each scored 0-100 against fixed reference points for its type. How we rank explains each one.
Independent measurements
Dissolved solids reduction, output and drain ratio measured by independent testers.
| Tested by | TDS reduction | Output | Pure to drain | Conditions |
|---|---|---|---|---|
| Water Filter Guru | 93.8 % | 42.7 gpd | 0.2 :1 | Tap Score lab test: 875 ppm TDS before, 54 ppm after. Flow measured without a booster pump (12 oz in 189.47 s); 64 oz of pure water sent 328 oz to drain (1:5.1). Date is the review update date. |
Specifications
| Model number | ROES-PH75 |
|---|---|
| Filtration | |
| Output | 75 gallons a day |
| Stages | 6 |
| Remineralization | Yes |
| NSF/ANSI 58 | Yes |
| Other certifications | NSF/ANSI 372 |
| Replacement filters | $133 a year |
| Build | |
| Tank | 4 gal |
| Booster pump | No |
| Smart faucet | No |
| Warranty | 1 year |
Alternatives in this type
APEC ROES-50
#7 in With tankFull review
For a small household that wants a certified tank RO system at a low price. Larger families should look at the ROES-100.
Amazon $179.99$179.99
Express Water ROALK10MBN
#9 in With tankFull review
For a buyer who wants mineralized water at a low price. The RO5DX is the safer pick if certification matters.
Amazon $199.99$199.99
Compare
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