Description
Coway P-09CL Large-Capacity Under-sink RO Water Purifier At a Glance
The P-09CL is an RO under-sink purifier with the unit and large storage tank installed under the sink, dispensing ambient water through a dedicated faucet. CowayCA lists the tank at 4 gal (about 15L), though some U.S. sales materials show 4.4 gal.
Key Features
Installed under the sink for more counter space
The purifier and tank go under the sink with only the faucet exposed on top. This frees counter space while keeping water access simple.
5-stage filter system with tool-free replacement
Uses 5 filters total: 20μm and 5μm Sediment, Neo Sense, RO Membrane, and Plus Inno Sense (D). The filter cover case and tool-free design make installation and maintenance easy.
Large tank with fridge/ice maker connection options
Uses a large purified water storage tank of about 4 gal (CowayCA standard), with fridge or ice maker line connection available for an additional service fee. Extra storage tank connection options are also available.
RO filter system meeting WQA and NSF/ANSI standards
Neo Sense is certified to NSF/ANSI 42, RO Membrane to NSF/ANSI 58, and Plus Inno Sense (D) to NSF/ANSI 42 and 53. Each filter plays a specific role in staged water treatment.
Specifications
| Model | P-09CL |
|---|---|
| Product Type | Large-tank under-sink RO water purifier |
| Dispensing temperature | Ambient purified water |
| Dimensions | 13.8 × 8.7 × 16.4 in (W × D × H) |
| Ambient Tank | 4 gal (about 15L) per CowayCA |
| Power | Not required · Non-powered operation |
| Dispensing Method | Dedicated faucet |
| Filter Configuration | Sediment 20μm → Sediment 5μm → Neo Sense → RO Membrane → Plus Inno Sense(D) |
| Fridge connection | Available · Additional $25 service fee per CowayCA |
| Additional tank | Connection available · $50 + tax per CowayCA |
| Color | White |
The current CowayCA product page lists storage capacity as 4 gal (about 15L). Some Coway U.S. sales sites show the same model as 4.4 gal, so this text follows the CowayCA page.
5-stage filter configuration and replacement cycles
| Filter | Primary Role | Recommended Replacement | Official Price |
|---|---|---|---|
| Sediment 20μm (CSFM11-20) | Pre-treatment: filters large sediment and particles first | 4–6 months | $32 |
| Sediment 5μm (CSFM11-5) | Removes smaller sediment and particles | 4–6 months | $33 |
| Neo Sense (CNFM11) | Pre-treatment for chlorine, taste, odor, and fine particles | For 8 months | $35 |
| RO Membrane (CRMFM11-50) | Precision RO filtration for TDS, some heavy metals, nitrates, and more | 24 months | $127 |
| Plus Inno Sense(D) (CIFM11-D-PLUS) | Post-treatment for taste, odor, lead, VOCs, and more | 12 months | $61 |
Based on the official Coway USA filter shop P-09CL compatible filters as of September 2026. Actual replacement cycles may vary with source water conditions and usage; prices are subject to change.
What to check for installation and use
| Under-Sink Installation | Unit and storage tank install under the sink to free counter space |
|---|---|
| Power-Free | No electricity needed — no outlet or power consumption |
| Large Water Tank | Generous 4 gal purified water storage (CowayCA standard) |
| Faucet Dispensing | Dispenses ambient water through a dedicated faucet on the sink top |
| Fridge / Ice Maker | Fridge/ice maker water line connection available for an additional service fee |
| Tool-Free Filter | Filter cover case and tool-free replacement for easy maintenance |
Rental & Purchase Pricing
| Plan | Duration | Regular Price |
|---|---|---|
| Rental · In-home service | 6 Yrs | $30.99 / month |
| Rental · In-home service | 5 Yrs | $34.99 / month |
| Rental · In-home service | 3 Yrs | $38.99 / month |
| One Pay | — | $1,199 |
The P-09CL may be subject to monthly promotions, so check the regular price and current promotionsplease check the regular price and current promotions.
View This Month's Promotions →Regular rates confirmed September 2026; tax is separate. Promo pricing may change by period and contract terms, so only regular rates are shown in the table.
Who It's Best For
Homes and small offices with high water use
The large 4 gal storage tank provides reliable use for frequently filling pots, bottles, and pitchers.
Kitchens that want to keep counters clear
Ideal for those who want the unit and tank hidden under the sink with only the faucet exposed, without losing counter space to a purifier.
For those who want purified water connected to their fridge or ice maker
An additional service connects your fridge or ice maker water line, so one RO system serves multiple uses.
Frequently Asked Questions
What kind of purifier is the P-09CL?
It's a non-electric RO under-sink purifier with the unit and large storage tank installed under the sink, dispensing ambient water through a separate faucet.
What is the purified water tank capacity?
The current CowayCA product page lists 4 gal (about 15L). Some U.S. sales materials show 4.4 gal, so this page follows the CowayCA figure.
Does it need electricity?
No. It's a non-electric design that works without an electrical connection — no outlet or power consumption needed.
Can it connect to a fridge or ice maker?
Yes. CowayCA offers fridge or ice maker connection for an additional $25 service fee. Actual install eligibility depends on your plumbing.
How many filters does it use?
It uses 5 filters total: Sediment 20μm, Sediment 5μm, Neo Sense, RO Membrane, and Plus Inno Sense (D).
What are the filter replacement cycles and prices?
Per official Coway USA as of September 2026: Sediment 20μm 4–6 months/$32, Sediment 5μm 4–6 months/$33, Neo Sense 8 months/$35, RO Membrane 24 months/$127, Plus Inno Sense (D) 12 months/$61.
How big is the product?
13.8 × 8.7 × 16.4 in (W × D × H). Beyond the unit itself, you'll need space for the storage tank and filter replacement access, so check your under-sink space before ordering.
How much are the rental and one-time purchase prices?
At regular rates, visit-maintenance rental is $30.99/mo for 6 years, $34.99/mo for 5 years, $38.99/mo for 3 years; outright purchase is $1,199. Actual amounts may vary with tax and promotions.
Recent Installation Areas
These are areas where customers have had this product installed. Only cities are shown to protect customer privacy.
- Ontario, CA
- NORTH HILLS, CA
- Los Angeles, CA
- LOS ANGELES, CA
- Torrance, CA
- San Diego, CA
- Irvine, CA
- Aubrey, TX
- La Mirada, CA
- Buena Park, CA
- Porter Ranch, CA
- Artesia, CA
- Downey, CA
- Loma rinda, CA
- Ranch PV, CA
- CA
- TX
- NC
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