ProOne has carved out a strong niche in the water filter world, especially for people who want serious contaminant removal without depending on electricity or complicated plumbing. If you want to understand the basics first, read our guide on what filtered water is.
Their lineup covers gravity-fed systems, countertop units, under-counter installations, and even portable travel models. The ProOne G2.0 and ProMax filter elements are the heart of these systems, targeting over 200 contaminants through a combination of ceramic and carbon media. Learn more about different water filter cartridge types to see how ProOne compares.
In this review, we dig into every model — specs, real-world performance, what users love, and where ProOne falls short. Here’s what you need to know before buying.
ProOne filters use ProOne and ProMax technology to remove over 200 contaminants from water. They're lab-tested to NSF standards, require no electricity, and offer models for every situation from home countertops to outdoor travel.
Why Should You Choose The ProOne Water Filter System?
There are several compelling reasons to consider ProOne for your water filtration needs. They’re very serious about their quality product, and they’re committed to customer service.
The ProOne customer service is very quick to answer all your questions.
They provide a complete line of filtration products, whether you need daily filtering or an emergency backup system. For emergency situations, also check our survival water filter guide. Options include countertop, gravity, inline, pitcher, on-the-go, and shower models.
With ProOne filter technology, you get the most progressive and reasonably priced solutions for clean water. The brand is recognized worldwide and driven by innovation.
Their filters are lab-tested to NSF-42 and NSF-53 P231 standards. One thing to know: only the NSF-42 component certification has been formally awarded so far.
All systems are designed for home use, traveling, or emergency situations. Maintenance is simple with occasional cleaning and filter replacement, and all products are backed by limited warranties.
For Gravity Systems
The gravity filtration systems from ProOne offer several unique advantages. They feature all-in-one filter technology with silver infusion that helps prevent bacterial growth. Learn more about whether water filters remove E. coli and how ceramic filters compare.
No priming is required, which simplifies setup and daily use. The systems are NSF-42 component certified and available in 4 sizes for maximum performance flexibility.
Innovation-driven execution, lab testing, and responsive customer service are key reasons to consider ProOne gravity systems.
Quick Facts
ProOne Countertop Water Filter System With ProMax
The countertop system has dimensions of 4.75 by 4.75 by 12.5 inches with a single-stage design. Compare this with other countertop water filter options. It features a BPA and BPS free ABS plastic housing and requires no electricity.
Working pressure ranges from 124 Kpa (20 psig) minimum to 689.5 Kpa (100 psig) maximum. Working temperature ranges from 5 degrees C (41 degrees F) to 38 degrees C (100 degrees F).
The suggested flow rate is 0.2 to 1.0 GPM with a filter life expectancy of up to 1 year.
ProOne Under Counter System With ProMax
The under counter system shares the same dimensions at 4.75 by 4.75 by 12.5 inches with a single-stage design. For another under-sink option, see our Kube water filter review. Maximum working pressure is slightly higher at 860 Kpa (125 psig).
It uses the same BPA and BPS free ABS plastic housing and requires no electricity. The filter life expectancy matches the countertop model at up to 1 year with a 0.2 to 1.0 GPM flow rate.
ProOne Traveler
The Traveler has a 1.6 gallon capacity with a height of 18.5 inches and diameter of 7.5 inches. It accommodates one standard filter with a maximum of one ProOne G2.0 5-inch filter.
The package includes a solid 304 stainless steel spigot and non-slip pad. No priming is required, and a wrench is included for easy installation.
It’s recommended for one person.
ProOne Nomad
The Nomad has a 2 gallon capacity with a height of 19.5 inches and diameter of 8.5 inches. It holds one standard filter with a maximum capacity of two filters.
You get four filter options: one or two ProOne G2.0 5-inch filter elements, or one or two ProOne G2.0 7-inch filter elements. With 2 filters installed, the flow rate will be faster.
The 7-inch filters have a larger surface area and generally last longer. It’s recommended for one or two people.
Dual-Stage Countertop System
The dual-stage countertop system measures 11 by 4.75 by 12.5 inches. It comes with both a ProMax filter and a pre-sediment filter for two-stage purification.
The 5-micron pleated pre-sediment filter protects the main filtration system from sediments.
Dual-Stage Under Counter System
The dual-stage under counter system measures 11.25 by 4.75 by 13.25 inches. It also includes both a ProMax filter and a 5-micron pre-sediment filter.
It fits with or without a faucet and includes metal mounting brackets.
After Unpacking
ProOne Countertop With ProMax
We loved the high-quality fittings and housing. It comes with an all-in-one ProMax water filter element that can be replaced very quickly.
An optional adapter is available to connect other tap types. It fits high-quality faucets with a detachable aerator, and the included diverter valve lets you switch between filtered and direct tap water.
It comes with full 3/8” polyethylene tubing and can be used every day.
ProOne Under Counter With ProMax
This model comes with an easy-to-install mounting bracket, connect fittings (3/8 inches), and polyethylene tubing. It has high-quality housing and accessories with no electricity required.
One ProMax filter element and a lead-free faucet kit with wrench and chrome plating are included. Filter elements are easy to replace, and T-Valve adapters are available as an option.
It’s highly recommended if you want to make the installation process easier.
ProOne Traveler
We were impressed by the standard 304 polished stainless steel construction. The item is recommended for one person, and the ProOne 304 logo is stamped on it.
A wrench is included for easy installation, and the all-in-one filter element is budget-friendly. It comes with the new ProOne G2.0 5-inch filter that can be used for up to 6 months.
All spigots are metal construction.
ProOne Nomad
The Nomad comes with four filter options so you can choose either 1 or 2 filter elements. Since the ProOne G2.0 7-inch filters have a larger surface area, they generally last longer than the 5-inch versions.
The ProOne 304 logo is embossed on the body, and a wrench is included for easy installation.
Dual-Stage Systems
Both dual-stage models come with a ProMax filter and a pre-sediment filter. The 5-micron pleated pre-sediment filter protects the main system from sediments, while the all-in-one filter element reduces or removes over 200 contaminants.
High-quality fittings and housings are standard.
The dual-stage under counter system also fits with or without a faucet. You can pick individual or dial brackets, and metal mounting brackets are included.
The main filter life is up to 1 year, while the pre-sediment filter life depends on the number of sediments in the water. The diverter valve on the countertop version allows you to switch between filtered and direct faucet water.
Structure
The Countertop water filter sits on your kitchen counter, while the Under Counter filter is tucked away below. The ProOne Traveler is smaller and more portable, making it easy to fit in tight spaces.
The Nomad sits between the Traveler and the Big systems in size. It’s constructed to offer both portability and higher flow rates than the Traveler.
All filters come with filter elements, high-quality fittings, and are made of high-quality steels. They include mounting brackets, polyethylene tubing, and replacement filters where needed.
The structures are simple enough to carry and install easily and are perfect for everyday use.
The Contaminants That ProOne G2.0 Filter Element Removes
This is what makes ProOne truly impressive. Independent lab testing showed that the filter removes all or almost all of the following contaminants: volatile and semi-volatile organic contaminants, pesticides, heavy metals, disinfectants, and inorganic non-metallic contaminants including fluoride, chlorine, and chloramine.
The filter also removes bacteria and viruses, herbicides, microplastics, microcystins (toxins from freshwater blue-green algae), radiological contaminants, blue-green algae parasites, and pharmaceuticals.
It’s tested to remove 100% of lead, which is extremely impressive. Compare this with other options in our best water filters for lead roundup. The filter reduces calcium by about 81% but doesn’t remove magnesium and only 2.5% of potassium.
This means the nutritional value of the water remains intact, and it also helps in removing bad tastes and odors.
The ProOne G2.0 filter's ability to remove 100% of lead while retaining essential minerals like magnesium and potassium sets it apart from many competitors. You get safe water without losing beneficial nutrients.
Pros & Cons
ProOne Gravity Water Filter System
The ProOne gravity water filter is a high-capacity countertop system made from 304 stainless steel. It uses ProOne G2.0 ceramic and carbon filter elements to remove over 200 contaminants including fluoride, lead, bacteria, and viruses with no electricity required.
Pros
- Removes over 200 contaminants including fluoride and 100% of lead
- No electricity or plumbing required for gravity models
- Silver infusion prevents bacterial growth
- Multiple size options from travel to family-sized
- NSF-42 component certified with independent lab testing
- Retains beneficial minerals like magnesium and potassium
Cons
- Filtration process can be slow compared to pressurized systems
- Stainless steel lid may show rust after extended use
- Some users report leaking at the spigot
- Only NSF-42 formally certified despite broader lab testing claims
- Higher price point than basic gravity filters
Advantages
Countertop With ProMax
The countertop model fits standard fittings with detachable aerators. It can be installed in less time without the help of any tool, and it delivers safe, sweet-tasting drinking water.
The ProMax technology reduces or eliminates over 200 contaminants with no energy required. Once you install it, you get access to purified water by opening the faucet or diverter valve.
It includes high-quality accessories, requires no cleaning, and uses BPA and BPS free plastics with replaceable filters.
Under Counter With ProMax
This is a handy filter system similar to a reverse osmosis setup. For actual RO systems, see our countertop reverse osmosis water filter guide. It retains all the minerals in your water and requires no extra space since it installs under the sink. Learn how to install an under-sink water filter for general tips.
Installation is easy, it’s certified by a third-party lab, requires no electricity, and features replaceable filter elements.
Traveler and Nomad
Both models use high-quality 304 stainless steel construction with no priming required. Silver infusion prevents bacterial growth, and beneficial minerals like calcium remain in the water.
There’s no need for add-on filters that slow down the flow rate or require frequent replacement.
Dual Countertop System
The dual-stage countertop system offers ProMax all-in-one filter technology that removes over 200 contaminants. It includes a detachable aerator and requires no electricity.
It uses BPA and BPS free filter elements with replaceable components.
Dual Under Counter System
The dual-stage under counter version fits into any sink, including kitchen, laundry, and bathroom. The 5-micron pre-sediment filter reduces the harmful effects of sediments like dirt, sand, and rust.
It’s perfect for use with city water, bore water, rain tank water, well water, and dam water. For well water specifically, see how to install a whole house water filter on a well. It removes or reduces over 200 contaminants.
Disadvantages
Countertop With ProMax
The countertop model only filters water from the tap where it’s installed. Some users may not like the filter sitting on the kitchen counter for aesthetic reasons.
It’s bigger in size, requiring more counter space, and the price point is higher than basic filters.
Under Counter With ProMax
You must check if a tap is provided with your purchase. Since the water comes from an external tap, if you don’t get a tap provided with it, you’ve to buy one separately.
You can’t use the kitchen tap, and this may cause extra costs. The system only filters water at the outlet where it was installed, so if you need filtered water in the shower, you’ve to install there separately.
You must also keep the area under the sink dry and make sure the faucet hole is provided during installation. If it’s not installed properly, issues like wastage of water drain may cause problems in the purifier.
Traveler
The stainless steel lid might begin to show rust after a few months of use. Some users find the filtration process slow, and reports indicate it doesn’t always drain completely.
Nomad
The filter may develop leaks after extended use. Some users report the water develops a slight odor after several months, although these complaints are infrequent.
Overall Disadvantages
The knob on the cover can be difficult to place. The system doesn’t always remove radioactive contaminants successfully, and the filter elements last only about 1 year.
How To Install The Filter
Select a Location
Choose a cool place on a flat surface for your device. Avoid areas with direct sunlight or heat exposure.
Setup Process
Start with the knob on top of the lid. Insert the screw from inside the cover and tighten with a screwdriver.
Then install the spigot by removing the nut and inserting both stainless and white washers on the threaded stem.
Add the spigot through the hole on the side of the lower container. Place both washers on the threaded stem and secure with a nut.
Tighten the nut and place the black non-slip pad below the lower container.
Installation Of The Filters
Set the black washer into the filter stem, then place the filter stem through a hole in the upper container. Install the wing nut below the upper container and repeat if needed.
Don’t overtighten. Plug the remaining holes with the enclosed plugs and set the upper container into the lower container.
Cleaning The System
Wash your hands first before cleaning. For the stainless steel parts, use liquid dish wash soap and the yellow (soft) side of the scrubby sponge.
Rinse well and never use the rough side on stainless steel surfaces.
Cleaning The Filters
After washing your hands, remove the filters and hold them by the plastic base. Place the filter under cold running water and use the rough side of the sponge to scrub the white ceramic portion.
Rinse well, but never use soap on the filter. Don’t allow water to reach the stem of the filter.
Store properly until ready to reinstall.
How Does The ProOne Water Filtration System Work?
The system consists of two containers, upper and lower. The filters sit in the upper part, and you pour water into it.
The water passes through the filters and flows to the lower container by gravity.
The spigot near the lower container dispenses the purified water. No plumbing is involved in the process, making it straightforward for anyone to use.
What Others Are Saying
Customers love these specialized stainless steel products, finding them convenient and easy to use. Installation and cleaning are simple, and filters are easily changeable.
Many report the water tastes great and it works with any water source including tap, river, pond, rain, stream, and lake water. For other gravity water filter options, see our dedicated guide.
The different size options allow customers to choose according to their requirements. No add-on filters are required, and maintenance is minimal.
The filtered water correctly removes contaminants like chlorine and aluminum while retaining nutritional minerals like magnesium and potassium. Read about the dangers of not changing your water filter to understand why regular replacement matters. You can also explore carbon block water filters and point of use water filters as alternatives.
However, some customers report concerns. The filtration process can be slow, and some notice unpleasant odors from the water over time.
Lids may get rusty after extended use, and some struggle with a leaking spigot.
A few customers mention difficulty pouring water without leaking unfiltered water into the lower chamber. Some note that beyond the NSF-42 certification, there are no additional formal certifications.
Price is another point of criticism for some buyers.
Frequently Asked Questions
It does. The ProOne G2.0 element has been independently lab-tested and shown to remove fluoride along with over 200 other contaminants. That includes inorganic non-metallics like chlorine and chloramine as well.
ProMax elements for the countertop and under-counter models go up to a year. The G2.0 elements used in gravity systems like the Traveler and Nomad last about 6 months, though that can vary with your water quality and how much you use it.
Nope. The gravity models run on — well, gravity. And the countertop and under-counter systems just use your home's normal water pressure. No outlets, no batteries, no cords to deal with.
They've been independently lab-tested to NSF-42 and NSF-53 P231 standards, but here's the important distinction: only the NSF-42 component certification is formally awarded. The broader testing covers VOCs, heavy metals, bacteria, viruses, and more, but those results come from independent labs rather than formal NSF certification.
Final Thoughts
ProOne has built a solid reputation for a reason. Their G2.0 filter elements tackle an impressive list of contaminants — over 200 including fluoride and lead — and they do it without needing a single watt of electricity.
The gravity models are the standout. They're portable, work anywhere, and deliver thorough purification. The main tradeoff is speed — gravity filtration takes its time. If you want faster output, the countertop and under-counter ProMax systems filter quicker but sacrifice portability.
The rust issue on the stainless steel lid is worth noting, and it's fair to point out that only the NSF-42 certification is formal — the rest is independent lab testing. But for the price and the breadth of contaminants it handles, ProOne is genuinely competitive.
ProOne earns an 8.0/10 for its impressive 200+ contaminant removal, no-electricity operation, and versatile product lineup. The slow filtration speed and potential for rust on the stainless steel lid are drawbacks, but the ProOne G2.0 filter technology delivers some of the best gravity-fed purification available at this price point.
