Royal Berkey Gravity Water Filter System 3.25 Gal
- Capacity: 3.3 gallons
- Purification Method: Unique Black Berkey Proprietary Filter Media
- Installation Type: Countertop
- Supported Water Tds Level Maximum Ppm: 500
Last refreshed Aug 4, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A well-reviewed stainless gravity system for households that want to filter water in bulk without plumbing it into a sink, provided there is room for a 23-inch-tall unit.
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ASIN: B00BWIWZJIModel: RB4X2-BBCategory: Water Filtration Systems
Overview
The Berkey RB4X2-BB is a freestanding gravity filtration system built around two Black Berkey purification elements, holding 3.25 gallons in a stainless steel housing that needs no plumbing or electricity.
Gravity systems like this trade convenience for independence: water sits in an upper chamber and drips through the Black Berkey elements into the lower reservoir, so there is no faucet hookup, filter housing, or power cord to install. At 9.5 x 9.5 x 23 inches it is counter-scale, not pitcher-scale, so buyers should have space set aside for it.
- 3.25-gallon stainless steel capacity
- Freestanding, no plumbing or power required
- Two Black Berkey proprietary filter elements
- 9.5 x 9.5 x 23 in footprint
Who it's for
Fits households that want a large-batch, off-grid-capable filtration setup for a kitchen counter, or anyone prioritizing a filter that doesn't rely on plumbing or a power outlet. Less suited to small kitchens short on counter space or buyers who want single-glass, on-demand filtering.
Pros and cons
- Filters up to 3.25 gallons without any plumbing or electricity
- Stainless steel construction
- Uses two Black Berkey purification elements
- Tall footprint at 23 inches needs dedicated counter space
- Gravity filtering is slower than a pressurized or pitcher system
Performance notes
Water gravity-feeds through the Black Berkey elements rather than being pumped or pressurized, so filtering a full 3.25-gallon batch takes time rather than being immediate at the tap; that's the standard tradeoff for a system needing no plumbing or power.
Specifications
| Brand | Berkey |
|---|---|
| Model | RB4X2-BB |
| Dimensions & fit | |
| Item Dimensions L X W X H | 9.5 × 9.5 × 23 inches |
| Capacity & performance | |
| Capacity | 3.3 gallonslower than 62% of 46 water filtration systems |
| Maximum Flow Rate | 0.1 gpm |
| Power & efficiency | |
| Power Source | Gravity |
| Construction & materials | |
| Material Type | Stainless Steel |
| Compatibility & installation | |
| Installation Type | Countertop |
| Included components | |
| Unit Count | 2 |
| Included Components | System, 2 Black Berkey Elements, Standard Spigot |
| Warranty & support | |
| Supported Water Tds Level Maximum Ppm | 500 |
| Other details | |
| Purification Method | Unique Black Berkey Proprietary Filter Media |
| Container Type | Stainless Steel Chambers |
| Number Of Items | 1 |
| Other Special Features Of The Product | Portable |
| Part Number | RB4X2-BB |
| Item Highlight | Includes 2 Black Berkey Elements, Easy-To-Assemble Stainless Steel Countertop Water Filtration System For Everyday Use |
Closest rivals on specs
Glacier Fresh GF-PC04 Water Filtration System- Capacity 3.3 vs 2.3 gallons (+43%)
Frequently asked questions
Does the Berkey RB4X2-BB need to be connected to a water line?
No, it is a freestanding gravity system; water is poured into the top chamber and filters down by gravity alone.
How much water does the RB4X2-BB hold?
Its stated capacity is 3.25 gallons.
What filter elements does it use?
It comes with Black Berkey proprietary filter media in a two-element configuration.