One enclosed cabinet
The filters and storage reservoir sit inside one housing, which can keep the cabinet layout neater than exposed housings plus a separate round tank.
Independent enclosed tanked RO guide
Brondell Circle RC100 Buying Guide
A certified under-sink reverse-osmosis system that hides its filters and integrated tank inside one cabinet, giving up some service visibility in exchange for a cleaner, self-contained layout.
As an Amazon Associate I earn from qualifying purchases. We do not claim firsthand testing.
Original editorial image, not an exact product photograph.
The short versionChoose it when you want non-electric tanked RO with an enclosed footprint and are comfortable with a dedicated faucet, drain connection, and proprietary filters.
Exact-model research Ownership planning Updated October 17, 2026
The purchase decision
Traditional stored RO water in a more contained cabinet.
The Circle RC100 is a good fit for a homeowner who wants certified reverse-osmosis treatment and stored water without a loose pressure tank or an electrical outlet. The enclosed housing can make an under-sink cabinet feel less scattered, and the two-part filter plan is simpler than the many individual stages used by some open-frame systems.
See the system
Start with the job it does, the space it needs, and the filters it requires.
The RC100 uses RF-20 for the sediment and carbon stages and RF-40 for the RO membrane. The two products have different schedules, so replacing the six-month set does not mean the membrane is automatically due.
- Cabinet size
- 13.8 × 9.25 × 16.5 inches
- Integrated storage
- 1.6 gallons
- Listed faucet flow
- 0.26 to 0.37 GPM
Circle RC100 at a glance
A practical choice when its treatment style matches the actual water problem.
Filtered water waits in the integrated 1.6-gallon tank and comes through the dedicated faucet. There is no powered pump, display, or smart faucet to manage. Like other tanked RO systems, flow and usable volume depend on tank pressure, source pressure, water conditions, and the refill cycle.
Avoid it when the cabinet cannot accommodate the tall enclosure, when a drain saddle or faucet hole is not practical, or when you want standard open housings with broadly interchangeable parts. It is not for microbiologically unsafe water without adequate disinfection.
Everyday benefits
What this system could make easier in a real kitchen.
These benefits come from the published design, specifications, and maintenance requirements. They are not firsthand test results.
No outlet or powered pump
The system works from household water pressure, so it does not need an electrical connection for normal filtration and tank refill.
Claim-specific WQA certification
Brondell identifies certification to NSF/ANSI standards 42, 53, 58, and 372 for the exact Circle system and its named claims.
Two replacement groups
RF-20 covers the routine sediment and carbon stages, while RF-40 is the longer-life RO membrane. That makes the service plan easier to record.
Read the exact claim scope
Model-specific documents matter more than broad marketing language.
Brondell states that the Circle is WQA certified to NSF/ANSI standards 42, 53, 58, and 372. Those standards contain specific reduction, performance, and material-safety claims. Use the current performance sheet or WQA listing for the exact RC100 claim you care about, and keep genuine replacement elements in the certified configuration.
These are the published housing dimensions. Leave room for tubing, the faucet line, drain line, door swing, and filter service.
This is the listed storage capacity, not a promise that every 1.6 gallons will dispense at full faucet pressure.
The official specification sheet gives a range. Source pressure, tank pressure, water temperature, and filter condition can change real flow.
Brondell lists about 2.4 gallons of reject water per gallon of treated water under its test conditions. Home conditions can differ.
Claims belong to the exact system and filter
Use the current performance sheet or certification listing for the named model. Do not transfer a claim to a related model, third-party cartridge, private well, or unknown water source without supporting documentation.
Check the official documentation (opens in a new tab)Installation reality
The enclosure looks simple, but the plumbing is still a full RO installation.
The RC100 needs a cold-water connection, drain connection, dedicated faucet, and enough cabinet room to place and service the enclosure. Measure around the disposal, trap, shutoff valve, hinges, and stored supplies. Review the current manual before drilling or attaching the drain saddle.
6fit checks before orderingMeasure first and leave room for service.
13.8-inch depth9.25-inch width16.5-inch height plus service roomCold-water connectionDrain-saddle locationDedicated faucet opening
Review the current manual before drilling or changing plumbing. Use a qualified plumber when the shutoff valve, drain, sink material, faucet opening, water pressure, or local code makes the installation uncertain.
Cost of ownership
The replacement plan belongs in the buying decision.
Filter life depends on the manufacturer limit, water quality, and household use. Set aside maintenance money before choosing the system, and buy by exact part number.
Includes the sediment pre-filter, pre-carbon filter, and post-carbon filter used for routine service.
Provides the membrane stage. Water quality and performance can justify inspection or replacement sooner.
RO maintenance includes leak checks, sanitation, and condition checks beyond simply twisting in new filters.
Check the current seller price when you are ready to buy. We do not show a fixed annual dollar total because promotions, shipping, use, and early replacement can change it.
As an Amazon Associate I earn from qualifying purchases.
Exact-model buying path
Replacement filters for the Brondell Circle RC100
The replacement page includes current fit notes, the part number, and the Amazon buying option.
Compare before buying
Choose the treatment style, not only the most impressive specification.
These alternatives solve different household problems. The right choice depends on your water, available space, installation tolerance, and maintenance preference.
| System | Best reason to choose it |
|---|---|
| APEC ROES-50 | Choose for a more traditional open five-stage layout with a separate pressure tank and familiar service arrangement. |
| iSpring RCC7AK | Choose for traditional tanked RO plus an alkaline remineralization stage, accepting more exposed components. |
| Waterdrop G3P600 | Choose for a narrower powered tankless system with on-demand flow and no separate stored-water tank. |
Plan before ordering
Guides for the questions that usually decide the purchase.
Use these practical checks to compare the system with your space, routine, and ongoing filter plan.
Decision guide
Best for some kitchens, unnecessary for others.
Consider the Circle RC100 if
- You want certified tanked reverse osmosis without electricity.
- You prefer one enclosed housing over exposed filters and a separate tank.
- Your cabinet can handle the full working envelope.
- A dedicated faucet and drain connection are practical.
- You will maintain RF-20 and RF-40 on separate schedules.
Avoid it if
- ×You need a plug-in tankless system with higher on-demand flow.
- ×You want standard open housings and widely interchangeable cartridges.
- ×Your cabinet is too short or crowded for service access.
- ×You cannot add a drain saddle or dedicated faucet.
- ×You expect an RO system to make unsafe source water microbiologically safe on its own.
Questions before buying
Brondell Circle RC100 FAQ
Does the Brondell Circle RC100 need electricity?
No. It uses household water pressure and an integrated storage reservoir rather than a powered pump.
Which replacement filters fit the Circle RC100?
The exact routine set is RF-20 and the reverse-osmosis membrane is RF-40. They use different replacement schedules.
How much cabinet space does it need?
Brondell lists the enclosure at 13.8 inches long, 9.25 inches wide, and 16.5 inches high. Allow additional room for tubing, connections, and service.
Is the RC100 certified?
Brondell identifies WQA certification to NSF/ANSI standards 42, 53, 58, and 372. Check the current model-specific listing or performance sheet for the exact reduction claim.
Did Find My Water Filter personally test the RC100?
No. This guide is based on current Brondell documents and the exact Amazon listing. It does not present firsthand results.
Research record
What this guide uses.
This is a research-based buying guide built from current manufacturer material and exact Amazon listings. It is not a firsthand product test. Specifications, packages, prices, certification listings, and availability can change.
Ready to compare the current offer?
Confirm the model, faucet finish, cabinet fit, package contents, and replacement plan first.
Then review the current seller, return terms, warranty, availability, and checkout total.
Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases at no additional cost to you.