Custom Gravity Water Filter Combo Review: Lab & Hands-On Test

Full Analysis of the Phoenix 2.25-Gallon Gravity Water System + Patriot Pure Nanomesh Filters

Filtration: 4.26/5.00

Please note: Below filtration results are based on the results for the standard Patriot Pure Ultimate Water Filtration System housing with one Patriot Pure Nanomesh filter installed. The Phoenix 2.25-gallon system housing is nearly identical, so the results should translate.

The Phoenix 2.25-gallon system housing + Patriot Pure Nanomesh filter scored 4.26/5.00 for filtration. How? Most importantly, it achieved solid results in our 2026 lab testing and the filtered water tasted and smelled perfectly clean. Plus, the Nanomesh filter is well-covered by NSF/ANSI certifications for contaminant reduction and has extensive third-party testing to 100-400% filter life.

1. Lab Results: 4.49/5.00 (2026)

In our lab tests comparing an unfiltered and a filtered tap water sample, the Patriot Pure Nanomesh filter could remove 9 undesirable impurities and contaminants to below the minimum detection level (so essentially to 100%): chlorine, bromodichloromethane, dibromochloromethane, chloroform, copper, iron, manganese, nitrate, and fluoride.

The following substances remained in our water:

• Barium was reduced by a very high 98%.
• Boron was also reduced by a very high 94%.
• Strontium increased by 91%, which is unlikely to represent natural fluctuations and may suggest potential leaching. However, at 0.252 ppm, it was still ~6x lower than the strictest health guideline (1.5 ppm).

Lab Results Chart

Non-Potable Water

We have not yet tested the Patriot Pure Nanomesh filter with a non-potable water source. This evaluation is planned, and the page will be updated as soon as testing is completed and results are available.

2. NSF/ANSI Certifications and Other Test Data

The Patriot Pure Ultimate Water Filtration System + Nanomesh filters is certified by the NSF for the reduction of 75 important contaminants against NSF/ANSI standards 42, 53, and 401. These certifications include chlorine (99.99%), arsenic V (97.60-99.90%), cadmium (93.80-98.00%), chromium (95.50-96.50%), copper (98.90-99.90%), lead (99.90%), mercury (99.90%), selenium (98.20-99.90%), PFOA (99.90%), PFOS (99.90%), 50 VOCs (99.50%-99.90%) and several emerging contaminants, including trace pharmaceuticals, pesticides, and industrial chemicals (94.00-99.90%). Reduction rates are per the official performance data sheet.

Plus, it has extensive third-party testing to 100-400% filter life against NSF/ANSI standards 42, 53, 401 and other non-NSF/ANSI standards for nearly 200 contaminants – although some overlap may exist between certified and third-party tested contaminants.

Listed reduction rates include:

• Dozens of VOCs (99.90%)
• Dozens of semi-volatile organic compounds (99.90%)
• Dozens of pesticides, including herbicides and insecticides (77.70-99.90%; most 99.90%)
• 6 heavy metals: arsenic V (97.60-99.90%), cadmium (93.80-98.00%), chromium (95.50-96.50%), copper (98.90-99.90%), lead (99.90%), mercury (99.90%)
• Selenium (98.20-99.90%)
• Chloroform (99.90%)
• Other PFAS (99.90%)

Non-Potable Water

The Patriot Pure Nanomesh filter does not carry NSF/ANSI certifications or verified third-party testing for microbiological reduction (e.g., bacteria, cysts, or viruses). While the website claims the filter can trap “bacteria, viruses, cysts and other biological contaminants,” the Nanomesh filter manual explicitly states: “Do not use with water that is microbiologically unsafe or of unknown quality without adequate disinfection before or after the system.”

3. Filtration Process

The Patriot Pure Nanomesh filter comprises 3 filtration stages:

• Stage 1 is a sediment filter layer (mechanical filtration) which acts like a sieve to remove solid, undissolved particulates such as dirt or rust.
• Stage 2 is a proprietary carbon Nanomesh layer, which the manufacturer claims acts like a fibrous mat and carbon filter combined, removing particles as small as sub-nanometer in diameter including bacteria, viruses, and cysts.
• Stage 3 is a coconut shell carbon block core. Activated carbon removes things like bad tastes and odors, chlorine/chloramine, disinfection byproducts and other organics, as well as certain metals. In addition, the block structure provides fine mechanical filtration due to its smaller pore size compared to granular carbon.

4. Taste and Odor Test

In our test, the filtered water was odorless and had a perfectly clean taste.

Usability: 4.22/5.00

Please note: We conducted usability testing of this custom gravity filter configuration using a single filter element, then normalized the results to two elements for better comparability with other tested gravity filter systems.

The Phoenix 2.25-gal system with the Patriot Pure Nanomesh filter installed achieved a usability score of 4.22/5.00, based on its performance in the following categories:

1. Initial system assembly including filter priming (1.00/1.00)
2. Everyday use (3.02/3.50)
3. Filter replacements (0.20/0.50)

1. Initial Setup & Filter Priming: 1.00/1.00

Assembling the Phoenix system is easy, and it readily accommodates Patriot Pure Nanomesh filters in place of the Phoenix’s stock carbon filters without any leaking, thanks to the similar dimensions and build of the Phoenix and Patriot Pure systems. The two fold-out instruction sheets provide clear directions as well as a few illustrations. Plus, there is a helpful tutorial video on YouTube.

Here’s a quick breakdown of the setup procedure:

1. Wash your hands. Wash the lid, upper chamber, and lower chamber with warm soapy water. Rinse and let dry.
2. Attach the knob to the lid by inserting the screw and washer through the hole in the lid and screwing on the knob (hand tighten only).
3. Place the stainless steel tap washer with domed side facing the spigot onto the threaded part of the spigot, followed by one spigot washer. Insert the thread into the lower chamber hole.
4. Attach the remaining spigot washer over the exposed thread within the lower chamber and secure with the nut, hand tightening only.
5. Add a rubber washer onto the threaded end of the black piece that came with the Patriot Pure Nanomesh filter. Insert this threaded portion through one of the holes in the upper chamber via the bottom side.
6. From inside the upper chamber, screw the Patriot Pure Nanomesh filter onto this threaded tip to finger tight.
7. Repeat this process for the remaining filters. All holes without cartridges must have a silicone hole blocker inserted (two hole blockers come pre-installed and need to be removed if using more than two filters).
8. Place airlock clip(s) on the lower chamber.
9. Place the upper chamber onto the lower chamber. Make sure spigot is in the closed position (pointing right).
10. Fill the upper chamber with water, then cover with the lid.
11. Allow the system to fully process the water in the upper chamber to flush your filter(s). The first pass may be very slow – it’s recommended to allow it to run overnight.
12. Discard the filtered water and run 1-2 more full top chambers of water through the filters.
13. Wash bottom chamber after completing these flushes – now your system is ready to use.

2. Day-to-Day Use: 3.02/3.50

2.1 Speed & Water Capacity: 0.92/1.20

The Phoenix 2.25-gal system with two Patriot Pure Nanomesh filters is generally suited for daily use. However, it’s too slow for on-demand filtering, which we define as 1 cup in <1 minute – the combo filtered and dispensed 1 cup in ~3:53 min and 4 cups in ~34:12 min in our filtration speed tests. While still not on-demand, performance would improve substantially with additional filters: the system can accommodate up to four elements in parallel, which would roughly double filtration speed relative to the two-filter setup tested here.

Notably, the spigot sits above the bottom of the lower chamber, so the system must first process ~34 oz of water over ~43:27 min before any water can be dispensed. Consequently, starting from an empty system, the total time to filter and dispense 1 cup was ~47:20 min, while dispensing 4 cups took ~1:18 hours. It took ~3:30 hours to fully filter and dispense the entire feed tank.

Assuming average US household sizes of 2.55-3.15 people, we estimate that 8-10 cups of water per hour would satisfy sudden thirst bursts. As configured in our testing, the Phoenix system + Patriot Pure cartridges do not filter fast enough to keep pace with this demand. Yet again, performance would improve substantially with additional filters and permit the system to produce 10 cups per hour without difficulty.

Dispensing filtered water from a full lower reservoir is extremely fast – we measured about 2 seconds for 1 cup. The Phoenix system also includes an airlock vent clip to help maintain full filtration and dispensing speed.

In addition, its ample 1.73-gal (~27.7-cup) feed tank* and 2.08-gal (~33.3-cup) clean tank allow you to readily fill a 40-oz bottle or 2-quart pitcher from a single refill. Assuming 25.5–31.5 cups of daily water consumption for the average US households, we estimate 1–2 daily refills when filling the upper chamber to the top* – consistent with the other gravity water filters we tested.

However, actual refilling frequency will likely vary considerably depending on each household’s needs and preferences. Given the relatively slow filtration speed, most users likely would not want to wait until the feed tank is empty and the clean water fully depleted before refilling. Realistically, it is more practical to top off the feed tank at strategic times, such as before heading out to work or before bed, so the longer wait time is less disruptive. However, this requires some ongoing judgment from the user to ensure that the added feed water volume does not cause the clean tank to overflow.

2.2 Dispensing: 1.00/1.00

Using a full clean tank, dispensing water is extremely fast and without splashing, unless the spout is fully opened very quickly. The handle twists smoothly, and there is no dripping after the pour.

Due to the spout height, the system must be placed at the counter edge to dispense, unless you use the optional tank stand sold by Phoenix – this gives you another 6.6″ of clearance to fit a glass underneath. That said, you still won’t be able to fit a standard 40-oz bottle or 2-quart pitcher under the spout, even with the added height from the stand.

One caveat: dispensing the last 34 oz of water requires additional steps. The spigot sits slightly above the base of the clean tank, which means the last ~4 cups of water cannot be poured unless you are tilting the tank forward or manually ladle out the remaining water. However, this is a common limitation and applies to almost all gravity filters we tested.

2.3 Refilling & Size: 0.80/1.00

Refilling the Phoenix is straightforward. Simply use a pitcher or other container to fill the upper chamber with water. There are no max fill lines, however, and instructions do not specify a fill amount.

The included lid fits loosely but still keeps your feed water well covered. Plus, an optional water level spigot can be purchased separately from Phoenix for easy monitoring of your clean water level, which we highly recommend. Without it, the only way to accurately gauge the amount of water in the clean tank is to lift the upper chamber – something that can be cumbersome depending on how much water remains inside.

Measuring 8.5″x19.45″x10.3″ (WxHxD) including the lid’s knob and spigot, the Phoenix doesn’t fit under most kitchen cabinets (18″ clearance). Additionally, using the optional tank stand further increases the height.

At 6.4 lbs with two wet Patriot Pure Nanomesh filters installed (excluding the stand), its weight is about average for the gravity systems we tested. Its footprint is also about average, occupying ~56.75 in² (~0.39 ft²).

2.4 Other: 0.30/0.30

The Phoenix system includes a rubber ring on the bottom tank, preventing scratching or sliding on your counter tops. Alternatively, the optional tank stand comes with rubber-gripped feet which also prevent unwanted movement.

2.5 Outdoor Use

With tanks and a spigot made of 304 stainless steel, the Phoenix system is durable enough for outdoor use.

Its stowed size of 8.5″x13.25″x8.5″ (WxHxD; knob and spigot removed) and 6.4-lb weight (with two wet Patriot Pure Nanomesh filters installed, excluding the stand) are comparable to competing systems, making it a reasonably portable option as well.

3. Filter Replacements: 0.20/0.50

Filter replacements are simple as the cartridges are easily accessible in the upper chamber. However, there is no filter change indicator to alert you when it is time to change them.

Rated filter life is 200 gal per filter element; 2 cartridges therefore have a combined water filtering capacity of 400 gal.

Assuming 500 gallons of yearly water consumption for the average household, we predict you will have to replace the filters in a 2-cartridge configuration 1-2x annually.

Costs: 5.00/5.00

Based on value for money, the Phoenix 2.25-gal system incl. optional tank stand and water level spigot plus 2 Patriot Pure Nanomesh filters achieved a cost score of 5.00 out of 5.00, indicating it is priced below average for what it offers compared to competing systems (a score of 4.00 represents average value). Notably, its upfront price is slightly above average but its annual filter replacement costs are well below average compared to the other gravity filter systems we tested.

1. Upfront Price

As of March 6, 2026, the custom Phoenix 2.25-gal system including two Patriot Pure Nanomesh filters is priced at $320.96. Adding the optional water level spigot ($74) and tank stand ($52) brings the upfront total to $446.96, which is slightly above the $384.81 average across all the tested gravity filter systems.

2. Long-Term Expenses for Filter Replacements

Based on 500 gallons consumption and a 400-gal filter life for two Patriot Pure Nanomesh cartridges, we estimate $165 in annual filter replacement costs, which is well below the $234.50 average across all the tested gravity filter systems.

3. Product Warranty

The Phoenix system’s warranty covers the stainless steel chambers (10 years), spigot (1 year), and all other parts (6 months). They also provide a 100-day money-back, satisfaction guarantee.

The Patriot Pure Nanomesh filters come with a 1-year warranty and 90-day satisfaction guarantee.

4. Other Cost Factors

• Airlock vent clip prevents slow filtration/dispensing caused by an air-tight connection between the upper and lower chambers.
• Stainless steel water bottle included with the system.
• Nanomesh filters are claimed to be made in the USA.
• The optional water level spigot uses a plastic handle.

Additional

1. Construction

The system feels sturdy and well built, with 304 stainless steel upper + lower chambers and spigot. It has a highly reflective finish – some may find this appealing, but it’s also more likely to show smudges.

2. Size Options

The Phoenix gravity water filter system comes in 4 size options: 0.26, 1.5, 2.25, or 3.25-gal.

3. Packaging

The Phoenix system came nicely packaged and well protected with extensive bubble wrap. Plus, the tanks are wrapped in a mesh-like cloth instead of standard plastic, protecting your investment while also giving it a more high-end feel.

4. Frequent Customer Complaints

We read about issues with water bypassing the filter elements, leaking, and overall quality concerns with the Phoenix system. For the Patriot Pure Nanomesh filters, we read about delayed or incomplete shipments, extremely slow filtration, poor customer service, or bad taste/odor of the filtered water.

We did not experience most of these issues firsthand, though we did find the Nanomesh filters to process water more slowly than some of its competitors.

Bottom Line: Our #1 Gravity Water Filter (4.40/5.00)

Filtration weighted at 60%, and usability and cost at 20% each, the customized Phoenix 2.25-gal system with Patriot Pure Nanomesh filters scored a final rating of 4.40 out of 5.00.

Our custom Phoenix 2.25-gal system plus Patriot Pure’s Nanomesh filters is our top pick for best overall gravity water filter. It also claims the #1 spot for most effective filtration, as the Nanomesh filter completely removed 9 contaminants in our lab tests with no signs of potential leaching. Plus, it has by far the most NSF/ANSI-certified contaminants (including many important ones except germs), along with extensive third-party testing to 100-400% filter life. On top of that, filtered water was odorless and tasted perfectly clean.

The setup clinched the best all-rounder status as well, as it is easy to assemble, use, and maintain, though filtration speed is on the slower side. Build quality is excellent with durable 304 stainless steel construction, backed by a 10-year tank warranty and satisfaction guarantees. While upfront cost is slightly above average, ongoing costs are well below average.