Coway Modern Countertop RO (P-300L) review
By Daryna Klochko · Published · Specs checked Oct 15, 2026 · 
Scores 8.75/10, tied for 7th of the 9 countertop RO systems we track. At $1,099 it costs 3.3 times the category median of $329. Its 3-day return window is shorter than the 30-day category median.
A certified health claim: WQA lists it for Chlorine, Lead, Cysts, one of 4 among the 9 countertop RO systems
Running costs matter: about $216 a year in cartridges, 2.2 times the category median
- Price
- $1,099
- Certified for
- Lead · Cysts · VOCs +5
- Flow
- Not stated
- Cartridge life
- 6-month cartridge
- Cost per year
- $216
- Warranty
- 1 year
Certification
Listed by WQA under NSF/ANSI 42 · 53 · 58 · 401 for Chlorine, Lead, Cysts, VOCs, PFOA/PFOS, Microplastics, TDS, Arsenic, checked Oct 15, 2026. Search the WQA listings
- Chlorine
- Lead
- Cysts
- VOCs
- PFOA/PFOS
- Microplastics
- 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 countertop RO systems
All 9 countertop RO systems →| Model | Price | Certified for | Cost per year | Warranty | Score | Where to buy |
|---|---|---|---|---|---|---|
| Waterdrop M6SL Mineral Countertop RO | $329 | TDS | $70 | 1 year | 9.5/10 | Check price → |
| SimPure Y7P-BW Countertop RO | $369.99 | Brand claims only | $100 | 1 year | 9/10 | Check price → |
| iSpring RCD100 Countertop RO with Hot Water | $419.99 | Brand claims only | $80 | 1 year | 9.25/10 | Check price → |
| Coway Modern Countertop RO (P-300L)THIS MODEL | $1,099 | Lead · Cysts +6 | $216 | 1 year | 8.75/10 | |
| Coway Prime Countertop RO (P-6320L) | $1,199 | Lead · Cysts +5 | $170 | 1 year | 8.5/10 | See specs → |
