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You need the best Purewell reverse osmosis systems that fit your specific water needs. This guide covers 7 models, including countertop gravity filters and under-sink tankless units. We selected these picks based strictly on the specifications published on the product listings. The Purewell 7-Stage Gravity Alkaline Filter leads as the best overall choice for countertop fluoride reduction and alkaline water. It offers durable stainless steel construction and visible water levels. Other options include portable units and high-output tankless systems. Each model targets different contaminants like chlorine while varying in size and filtration stages. You can choose based on your space and purity requirements.
| # | Product | Best for | Price |
|---|---|---|---|
| 1 | Purewell 7-Stage Gravity Alkaline Filter Best overall | Countertop fluoride reduction and alkaline water | |
| 2 | Purewell 2.25G Countertop 7-Stage RO Best premium | visible water level monitoring and alkaline output | |
| 3 | Purewell 9-Stage Gravity Water Filter Best 9-stage | Countertop fluoride reduction without TDS change | |
| 4 | Purewell U01 800 GPD Tankless RO Best budget | High-output under-sink filtration | |
| 5 | Purewell C01 Countertop 4-Stage RO Best portable | portable countertop use with smart monitoring | |
| 6 | Purewell 5-Stage Gravity Water Filter Best 5-stage | Alkaline water and contaminant reduction | |
| 7 | Purewell 2.25G Gravity Water Filter Best 6-stage | gravity-fed precision filtration |
01 The Purewell Lineup at a Glance
Purewell offers seven distinct models, primarily separated by installation type and filtration stages. Countertop gravity filters, such as the 7-Stage Gravity Alkaline Filter and the 9-Stage Gravity Water Filter, suit shoppers who want visible water levels and alkaline output without plumbing. These units share a tall, stainless steel design. They prioritize fluoride and chlorine reduction over speed. For those needing high capacity in tight spaces, the U01 Tankless RO provides 800 GPD under-sink filtration. It operates without a storage tank. The C01 Portable Countertop RO serves RVs or offices where flexibility is key. Each model targets specific contaminants like chlorine. You should match the stage count and form factor to your daily water usage and available counter or cabinet space.
Purewell 7-Stage Gravity Alkaline Filter
Best for: Countertop fluoride reduction and alkaline water
- Filtration Stages
- 7-Stage
- Remineralization
- Alkaline
- Target Contaminant
- Chlorine
- Material
- Stainless Steel
- Dimensions
- 8.8 × 8.8 × 20 inches
- Weight
- 9.7 pounds
This Purewell system uses a 0.01 μm ultra-filtration membrane across seven stages to reduce fluoride, chlorine, and heavy metals. The stainless steel housing measures 8.8 by 20 inches and holds 2.25 gallons. It raises pH levels with alkaline filters. You get durable metal components and a water level window. This setup suits you if you want a countertop unit that improves water taste and mineral content.
- 7-stage filtration with 0.01 μm hollow fiber membrane
- Reduces up to 90% of fluoride
- 304 food-grade stainless steel housing
- Alkaline PH filter raises water pH
- Includes metal water level spigot and non-slip stand
- White PH filters require replacement every 2 months
- Black composite filters last only 6 months
- Weighs 9.7 pounds, making it less portable
- You want to reduce fluoride from tap water
- You prefer alkaline water for health reasons
- You need a durable stainless steel countertop filter
- You need a tankless system for immediate flow
- You want to avoid frequent filter replacements
- You require a gravity-fed unit for off-grid use
Verdict: Purewell 7-Stage Alkaline UF System offers strong fluoride reduction and durable construction for countertop use. It fits buyers who value alkaline water and visible water levels over tankless convenience.
Purewell 2.25G Countertop 7-Stage RO
Best for: visible water level monitoring and alkaline output
- Installation Type
- Countertop
- Filtration Stages
- 7-stage
- Remineralization
- Alkalizing materials
- Target Contaminant
- Chlorine
- Dimensions
- 8.8 × 8.8 × 20 inches
- Weight
- 10.8 pounds
This Purewell countertop unit uses a 7-stage gravity filtration process to treat tap water. It features a 0.01μm ultra-filtration membrane and alkalizing materials to adjust pH levels. The large stainless steel body includes a transparent water level window for easy monitoring. It suits users seeking visible water levels and alkaline output without complex installation.
- 7-stage filtration with 0.01μm hollow fiber membrane
- Transparent window monitors water level clearly
- Alkalizing materials raise pH for healthy water
- Reduces up to 90% of fluoride content
- Larger physical footprint at 20 inches tall
- Requires frequent PH filter replacement every 2 months
- Gravity-fed system offers slower flow than electric models
- You want to see the water level without opening the unit
- You prefer alkaline water for daily consumption
- You need a simple countertop installation without plumbing
- You require instant hot or cold water dispensing
- You have limited counter space for a 20-inch tall unit
- You want to avoid frequent filter maintenance
Verdict: Purewell 7-Stage Countertop Gravity Filter is a solid choice for households prioritizing alkaline water and visible filtration levels, provided you can accommodate its tall footprint.
Purewell 9-Stage Gravity Water Filter
Best for: Countertop fluoride reduction without TDS change
- Installation Type
- Countertop
- Filtration Stages
- 9-stage
- Target Contaminant
- Chlorine
- Dimensions
- 8.8 × 8.8 × 20 inches
- Weight
- 7.7 pounds
This Purewell countertop system uses a 9-stage gravity filtration process to treat tap water without electricity. It features a 0.01μm ultra-filtration membrane and a dedicated fluoride reduction stage. The stainless steel unit includes a water level window for easy monitoring. You get 2000 gallons of capacity from the composite filters. This setup suits users who want a large, gravity-fed unit with specific contaminant removal on their counter.
- 9-stage filtration with 0.01μm hollow fiber UF membrane
- Reduces 90% of fluoride using high-grade composite material
- Includes transparent water level window for monitoring
- 2000-gallon total filter capacity
- Does not lower TDS value
- Requires manual refilling of the top container
- Limited to countertop gravity operation without electricity
- You want to reduce fluoride without lowering TDS
- You prefer gravity-fed filtration over electric pumps
- You need a large 2000-gallon filter capacity
- You need to reduce dissolved solids (TDS)
- You want an under-sink installation
- You require automatic water flow without manual refilling
Verdict: Purewell 9-Stage Gravity Filter provides targeted fluoride reduction and high capacity for countertop use. It fits buyers who prioritize gravity-fed simplicity and specific contaminant removal over TDS adjustment.
Purewell U01 800 GPD Tankless RO
Best for: High-output under-sink filtration
- Installation Type
- Under-sink
- Daily Production Rate
- 800 GPD
- Filtration Stages
- 7-stage
- Pure to Drain Ratio
- 3:1
- Certifications
- NSF/ANSI 58, NSF 372
- Features
- Tankless
The Purewell U01 is an electric-free, tankless reverse osmosis system designed for under-sink installation. It features a 7-stage filtration process with a 0.0001 μm membrane to reduce contaminants. The unit produces up to 800 GPD of water with a 3:1 pure-to-drain ratio. Its compact 5.7 x 5.7 x 16 inch footprint saves cabinet space. This system suits users seeking high output and quiet operation without electrical connections.
- 800 GPD daily production rate
- 3:1 pure-to-drain water ratio
- Zero electricity required for operation
- NSF/ANSI 58 and 372 certified
- Compact 5.7 x 5.7 x 16 inch tankless design
- 8.4 pounds weight is heavier than some gravity alternatives
- 5.7 inch width limits placement in narrow cabinets
- 800 GPD capacity is lower than the 2.25G gravity models
- You need high water output for a large family
- You want to save under-sink storage space
- You prefer a system that does not require a power outlet
- You require a gravity-fed system for off-grid use
- You have very narrow under-sink clearance
- You prefer a larger storage tank for backup water
Verdict: The Purewell U01 Tankless RO System delivers high-capacity filtration without electrical power. It fits well in homes where space is tight and water usage is high.
Purewell C01 Countertop 4-Stage RO
Best for: portable countertop use with smart monitoring
- Installation Type
- Countertop
- Filtration Stages
- 4-Stage
- Pure to Drain Ratio
- 3.5:1
- Remineralization
- Alkaline
- Form Factor
- Portable
- Intended Use
- Home
The Purewell C01 is a countertop reverse osmosis system with a 4-stage filtration setup. It uses a 0.0001-micron RO membrane and alkaline particles to remove contaminants and adjust pH. The unit features a 152 oz removable tank and a smart touch panel for real-time TDS monitoring. Its portable pitcher design allows you to take filtered water anywhere. This system suits those needing flexible placement and easy setup without plumbing.
- 4-stage filtration with 0.0001-micron RO membrane
- Alkaline enhancement adjusts pH levels
- Smart touch panel tracks TDS and filter life
- Portable pitcher with 152 oz removable tank
- 3.5:1 pure-to-drain ratio
- Heavier build at 19 pounds compared to lighter gravity options
- Lower filtration stage count with only 4 stages
- Smaller pure-to-drain ratio of 3.5:1
- You want a portable pitcher for office or RV use
- You need real-time TDS monitoring via a touch panel
- You prefer alkaline water with adjusted pH levels
- You need a high-capacity under-sink system
- You want a gravity-fed system with no electricity
- You prefer a 5-stage or higher filtration setup
Verdict: Purewell C01 Portable Countertop RO System fits users who need a flexible, portable solution with smart monitoring. It is ideal for offices or RVs where plumbing is unavailable. The alkaline feature adds health benefits for those seeking pH-adjusted water.
Purewell 5-Stage Gravity Water Filter
Best for: Alkaline water and contaminant reduction
- Filtration Stages
- 5-Stage
- Certifications
- NSF/ANSI 372
- Remineralization
- Alkaline
- Target Contaminant
- Lead
- Intended Use
- Home
- Dimensions
- 8.8 × 8.8 × 20 inches
The Purewell 5-Stage Gravity Water Filter System uses ceramic and alkaline media to improve tap water taste and pH. It holds 2.25 gallons and features a transparent window to monitor levels. This unit is certified to reduce lead, PFAS, and microplastics. It suits households wanting alkaline water without electricity or complex plumbing. The system relies on gravity for filtration speed.
- 5-stage ceramic filtration with alkaline-enhancing media
- Reduces lead, PFAS, and microplastics
- Raises pH to 7.5–9 range
- Transparent water level window
- NSF/ANSI 372 certified lead-free materials
- Does not lower TDS levels
- Gravity-fed filtration is slower than pressurized systems
- Heavier build at 7.7 pounds
- You want alkaline water without electricity
- You need to reduce PFAS and lead
- You prefer visible water levels
- You need TDS reduction
- You want instant filtered water
- You have limited counter space
Verdict: Purewell 5-Stage Gravity Water Filter is a solid choice for those prioritizing alkaline water and contaminant reduction over speed. It fits users who value visible monitoring and chemical-free filtration.
Purewell 2.25G Gravity Water Filter
Best for: gravity-fed precision filtration
- Installation Type
- Countertop
- Filtration Stages
- 6-stage
- Material
- Stainless Steel
- Dimensions
- 8.8 × 8.8 × 20 inches
- Weight
- 7.7 pounds
This Purewell gravity water filter uses a 6-stage filtration process to remove contaminants. It features a 0.01μm hollow fiber UF membrane for precision filtration. The stainless steel unit includes a water level window for easy monitoring. You get up to 6000 gallons of filtered water from the composite filters. It sits on your countertop and requires no electricity.
- 0.01μm hollow fiber UF membrane
- 6-stage filtration process
- Transparent water level window
- 6000-gallon filter lifespan
- Stainless steel construction
- Does not lower TDS value
- Limited to 2.25-gallon capacity
- Incompatible with other brands' filters
- You want precision filtration under 0.1 microns
- You prefer gravity-fed systems over electric ones
- You need a countertop unit with visible water levels
- You need to reduce TDS levels
- You require a large water storage capacity
- You want to use third-party replacement filters
Verdict: Purewell 2.25G Gravity Water Filter suits users who prioritize fine particle removal and visual monitoring over TDS reduction. It is a solid choice for small households needing a simple, electric-free solution.
02 Specifications side by side
| Spec | Purewell 7-Stage Gravity Alkaline Filter | Purewell 2.25G Countertop 7-Stage RO | Purewell 9-Stage Gravity Water Filter | Purewell U01 800 GPD Tankless RO | Purewell C01 Countertop 4-Stage RO | Purewell 5-Stage Gravity Water Filter | Purewell 2.25G Gravity Water Filter |
|---|---|---|---|---|---|---|---|
| Installation Type | – | Countertop | Countertop | Under-sink | Countertop | – | Countertop |
| Daily Production Rate | – | – | – | 800 GPD | – | – | – |
| Filtration Stages | 7-Stage | 7-stage | 9-stage | 7-stage | 4-Stage | 5-Stage | 6-stage |
| Pure to Drain Ratio | – | – | – | 3:1 | 3.5:1 | – | – |
| Certifications | – | – | – | NSF/ANSI 58, NSF 372 | – | NSF/ANSI 372 | – |
| Remineralization | Alkaline | Alkalizing materials | – | – | Alkaline | Alkaline | – |
| Capacity | – | – | – | 800 GPD | – | – | – |
| Features | Alkaline | – | – | Tankless | Alkaline | Alkaline | – |
| Target Contaminant | Chlorine | Chlorine | Chlorine | – | – | Lead | – |
| Form Factor | – | – | – | – | Portable | – | – |
| Fuel Type | – | – | – | Electric | – | – | – |
| Material | Stainless Steel | – | – | – | – | – | Stainless Steel |
| Intended Use | – | – | – | – | Home | Home | – |
| Dimensions | 8.8 × 8.8 × 20 inches | 8.8 × 8.8 × 20 inches | 8.8 × 8.8 × 20 inches | 5.7 × 5.7 × 16 inches | 16.5 × 9 × 14.8 inches | 8.8 × 8.8 × 20 inches | 8.8 × 8.8 × 20 inches |
| Weight | 9.7 pounds | 10.8 pounds | 7.7 pounds | 8.4 pounds | 19 pounds | 7.7 pounds | 7.7 pounds |
| Size | Large | Large | Large | – | – | Large | Large |
| Color | Silver | Silver | Silver | White | – | Silver | Silver |
| Model | 68a4f008-3e13-41cd-9eee-811b21377759 | eaac13b1-8b7e-4fd8-ba5f-e22f8232fe46 | PW-FH-CF | U01 | C01-1 | PW-TCH | BO-2.25G |
03 Where Purewell Fits Your Home
Purewell covers two main installation types: countertop and under-sink. Countertop models dominate the range, featuring tall, stainless steel gravity filters with visible water levels. These units measure roughly 8.8 by 8.8 inches with a 20-inch height. For under-sink needs, the tankless U01 model offers a compact 5.7 by 5.7-inch footprint. The brand focuses heavily on alkaline output and gravity-fed simplicity. You will not find small, low-profile under-sink tanks or smart app-connected units in this lineup. If you need a discreet cabinet fit without visible water monitoring, these specific specs may not align with your space.
If you want to compare stage counts with another brand, you can review the best geekpure reverse osmosis systems.
04 How to Choose the Right One
Check Installation Type
Decide between countertop or under-sink placement first. Countertop models like the Purewell 7-Stage Gravity Alkaline Filter sit on your counter and use gravity. They require no plumbing. Under-sink units like the Purewell U01 Tankless RO hide under your sink. They need a dedicated faucet and connection to water lines. Choose countertop for rentals or RVs. Pick under-sink for permanent home installations with high daily water usage.
Review Filtration Stages
More stages do not always mean better water. The Purewell 9-Stage Gravity Water Filter offers extensive filtration for targeted contaminant removal. The Purewell C01 Countertop 4-Stage RO is simpler but still effective for basic purification. Match the stage count to your water quality needs. If you have municipal water, fewer stages may suffice. If you have well water, more stages provide better protection. Check the specific stages listed to ensure they target your concerns.
Assess Capacity Needs
Look at the gallons per day rating for tankless systems. The Purewell U01 offers 800 GPD for high-output households. Gravity filters rely on time rather than a fixed GPD rate. They fill a reservoir slowly. Estimate your daily drinking and cooking water volume. Large families need higher capacity tankless units. Small households or occasional users can manage with gravity-fed systems. Ensure the output matches your peak usage times to avoid running dry.
Compare Pure to Drain Ratio
Tankless RO systems waste water during filtration. The Purewell U01 has a 3:1 pure to drain ratio. This means three gallons of pure water for every one gallon wasted. Lower ratios are more water-efficient. Gravity filters do not use this metric as they do not drain waste water continuously. If water conservation is critical, prioritize systems with favorable ratios. Check the specifications for this ratio to understand your water usage costs and environmental impact.
Select Key Features
Features like alkaline output or smart monitoring change the water taste and user experience. The Purewell 7-Stage Gravity Alkaline Filter adds minerals for pH balance. The Purewell C01 includes smart monitoring for filter status. Decide if you want pH-adjusted water or just pure filtration. Alkaline features improve taste for some users. Smart monitoring helps you track filter life. Choose based on whether you prioritize taste enhancement or convenience alerts.
05 Frequently asked questions
Does Purewell make an under-sink reverse osmosis system?
Yes, the Purewell U01 is a tankless under-sink RO system. It delivers 800 gallons per day and operates without a storage tank. This model fits well in homes where space is tight and water usage is high. It provides high-capacity filtration for under-sink installation.
Which Purewell system produces alkaline water?
Several Purewell models produce alkaline water. The 7-Stage Gravity Alkaline Filter and the 7-Stage Countertop RO both feature alkaline filtration stages. The portable C01 Countertop RO also includes an alkaline feature. These units are ideal for users seeking pH-adjusted water.
How many filtration stages do Purewell filters have?
Purewell systems range from 4 to 9 filtration stages. The C01 Countertop RO has 4 stages. The U01 Tankless RO uses 7 stages. The gravity filters offer 5, 6, 7, and 9 stages. More stages typically target specific contaminants like chlorine or fluoride.
Do Purewell gravity filters require electricity?
No, the gravity-fed models do not require electricity. The 7-Stage, 9-Stage, 5-Stage, and 2.25G Gravity Water Filters operate using gravity alone. They are electric-free solutions. This makes them suitable for small households or areas without power access near the sink.
Is there a portable Purewell RO system?
Yes, the Purewell C01 is a portable countertop RO system. It is designed for flexible use in offices or RVs where plumbing is unavailable. Its form factor is portable, and it includes smart monitoring features. It is suitable for home use in temporary settings.
What is the best Purewell system for fluoride reduction?
The 7-Stage Gravity Alkaline Filter and the 9-Stage Gravity Water Filter are strong choices for fluoride reduction. Both are countertop gravity models. The 9-Stage option provides high capacity without changing TDS levels. These units target fluoride while offering visible water level monitoring.
How much water does the Purewell U01 produce daily?
The Purewell U01 Tankless RO system produces 800 gallons per day. This high capacity suits homes with high water usage. It maintains a 3:1 pure to drain ratio. The tankless design ensures you always have fresh filtered water without waiting for a tank to refill.
Are Purewell gravity filters made of stainless steel?
Yes, several gravity models are constructed from stainless steel. The 7-Stage Gravity Alkaline Filter and the 2.25G Gravity Water Filter feature stainless steel material. This provides durable construction for countertop use. The silver color and large size are consistent across these stainless steel models.
