Coway Under Sink RO (P-09CL) review
By Daryna Klochko · Published · Specs checked Oct 15, 2026 · 
Scores 8.75/10, tied for 17th of the 20 RO systems we track. At $1,199 it costs 2.6 times the category median of $459.99. WQA lists it for Chlorine, Lead, Cysts, VOCs, TDS, Arsenic, one of 12 RO systems out of 20 with a certifier listing for a health claim. Its 3-day return window is shorter than the 30-day category median.
Running costs matter: about $372 a year in cartridges, 1.8 times the category median
- Price
- $1,199
- Certified for
- Lead · Cysts · VOCs +3
- Flow
- Not stated
- Cartridge life
- 6-month cartridge
- Cost per year
- $372
- Warranty
- 1 year
Certification
Listed by WQA under NSF/ANSI 42 · 53 · 58 · 401 for Chlorine, Lead, Cysts, VOCs, TDS, Arsenic, checked Oct 15, 2026. Search the WQA listings
- Chlorine
- Lead
- Cysts
- VOCs
- TDS
- Arsenic
The contaminants or other substances removed or reduced by this water treatment device are not necessarily in your water. Listing checked on Oct 15, 2026. What a listing means and what it doesn't
Specs and sources
Checked Oct 15, 2026 · source under each valueFiltration
Cartridges and install
Buying
Warranty, returns and shipping
1 year when bought; the full term when rented.
3 days after installation.
Warranty: 1 year when bought; the full term when rented. Returns: 3 days after installation. Shipping: not stated by the brand. Source: Coway data sheet, checked Oct 15, 2026.
Source: Coway data sheet, checked Oct 15, 2026.
Compared with similar RO systems
All 20 RO systems →| Model | Price | Certified for | Cost per year | Warranty | Score | Where to buy |
|---|---|---|---|---|---|---|
| Pentair FreshPoint GRO-575 5-Stage Reverse Osmosis | $669.29 | Lead · Cysts +14 | $238 | 1 year | 9.25/10 | Check price → |
| Waterdrop G3P800 Reverse Osmosis System | $999 | Lead · PFAS +2 | $160 | 1 year | 9.75/10 | Check price → |
| Coway All-In-One Under Sink RO (P-160AL) | $1,099 | Lead · Cysts +5 | $433 | 1 year | 8.75/10 | See specs → |
| Coway Under Sink RO (P-09CL)THIS MODEL | $1,199 | Lead · Cysts +4 | $372 | 1 year | 8.75/10 | |
| Waterdrop X12 Reverse Osmosis System | $1,299 | TDS | $175 | 2 years | 9.5/10 | Check price → |
