APEC ROES-PH75
#8 in With tankFull review
For buyers who want a certified tank RO system with remineralization at a low price and can accept high water waste.
Amazon $189.99$189.99
The APEC ROES-PH75 is the better under-sink reverse osmosis system overall, rated 3.5 to 3.0. The APEC ROES-PH75 leads on certification. The Express Water ROALK10MBN wins on output. The APEC ROES-PH75 costs $10 less ($189.99 vs $199.99).
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
Prices were last checked November 2, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the APEC ROES-PH75 for certification (certified to NSF/ANSI 58 vs not certified to NSF/ANSI 58; certified to NSF/ANSI 372).
- Choose the Express Water ROALK10MBN for output (100 gallons a day vs 75 gallons a day).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every with tank under-sink reverse osmosis system; a clear win is highlighted. How we rank explains each one.
| Factor weight | APEC ROES-PH75 | Express Water ROALK10MBN |
|---|---|---|
| Overall rating | 3.5/5 | 3.0/5 |
| Certification 25% | 100 certified to NSF/ANSI 58 | 30 not certified to NSF/ANSI 58; certified to NSF/ANSI 372 |
| Filter cost 20% | 39 $133 a year in replacement filters | 35 $143 a year in replacement filters |
| Water wasted 15% | 50 drain ratio not published (neutral score used) | 50 drain ratio not published (neutral score used) |
| Output 10% | 50 75 gallons a day | 100 100 gallons a day |
| Price 15% | 80 $189.99 | 76 $199.99 |
| Warranty 15% | 0 1-year warranty | 0 1-year warranty |
Independent measurements
APEC ROES-PH75
| 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. |
Express Water ROALK10MBN
No independent test published yet.
Specifications
| APEC ROES-PH75 | Express Water ROALK10MBN | |
|---|---|---|
| Filtration | ||
| Output | 75 gallons a day | 100 gallons a day |
| Stages | 6 | 10 |
| Remineralization | Yes | Yes |
| NSF/ANSI 58 | Yes | No |
| Other certifications | NSF/ANSI 372 | NSF/ANSI 372 |
| Replacement filters | $133 a year | $143 a year |
| Build | ||
| Tank | 4 gal | - |
| Booster pump | No | No |
| Smart faucet | No | No |
| Warranty | 1 year | 1 year |