Filter United review

Updated September 30, 2026 · SmartHomeCue Editorial Team · Facts checked September 30, 2026

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Our verdict

Filter United suits US households that want a certified reverse-osmosis system and can handle a one-time installation, then keep running costs low at $40 to $80 a year. Its WQA Gold Seal coverage and 1 to 2 years warranty back the purchase, while the US-only market keeps it out of reach elsewhere.

Key facts

Best for
A certified reverse-osmosis system with low yearly filter cost for US households.
Filter system
Reverse osmosis (Source, checked September 30, 2026)
Reference models
VIVA21 5-Stage Reverse Osmosis Filtration System (V21RS5S01), VIVA21 6-Stage Alkaline RO System, VIVA21 Complete 5-Stage Filter Set (V21RF5S12), VIVA21 5 Micron Sediment Filter (V21RFS2510) (Source, checked September 30, 2026)
Price from
$199.99 (Source, checked September 30, 2026)
Cartridge price
$79.99 (Source, checked September 30, 2026)
Filter cost per year
$40 to $80 (Source, checked September 30, 2026)
Certification scope
WQA Gold Seal certification of the VIVA21 RO system covering NSF/ANSI 58 RO performance and NSF/ANSI 372 lead-free materials (Source, checked September 30, 2026)
PFAS and lead reduction
Yes (Source, checked September 30, 2026)
Installation required
Yes (Source, checked September 30, 2026)
Warranty
1 to 2 years (Source, checked September 30, 2026)
Markets
US (Source, checked September 30, 2026)
Headquarters
United States (Source, checked September 30, 2026)
Founded
2021 (Source, checked September 30, 2026)
Support channels
Email, Chat, Help-centre (Source, checked September 30, 2026)
NSF/ANSI standards
58
Official website
filterunited.com

Apps and profiles

Elsewhere
facebook.cominstagram.comyoutube.com

Pros and cons

Pros

  • Annual filter cost of $40 to $80 places the brand at 3 of 46, which is the strongest number in the range.
  • PFAS and lead reduction are stated outright rather than left vague.
  • A warranty of 1 to 2 years backs the hardware once fitted.
  • Entry price of $199.99 ranks 29 of 52 brands, so the system is not a premium ask.

Cons

  • Cartridge sets cost $79.99 and the brand ranks 35 of 50 on cartridge price, so replacement spending is the weaker side.
  • Installation is required, so there is a plumbing hookup and a drinking water connection to arrange before the first use.
  • Support runs on email, chat and help centre, so help is written and chat based rather than by phone.
  • Shipping covers US, so buyers outside that market should start with Culligan Consumer Products instead.

Ready to try Filter United?

Scored 9.0 / 10 by SmartHomeCue.

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Who it suits

  • US households ready to install a reverse-osmosis system and keep it for years.
  • Drinkers who budget for filters rather than hardware, since annual filter cost runs $40 to $80.
  • People who care about contaminant claims rather than brand age, given the stated PFAS and lead reduction.

Who should look elsewhere

  • Buyers outside US, who should start with Culligan Consumer Products and its range of under sink systems.
  • Anyone who wants a counter unit rather than plumbing: IBBL's countertop format fits that, while Filter United requires installation.
  • Shoppers chasing the lowest cartridge price, since Filter United ranks 35 of 50 on that measure.

What it does well

Filter United builds around reverse-osmosis filtration, and the brand states PFAS and lead reduction as part of the deal rather than a footnote. Installation is required, so expect a plumbed hookup and a drinking water connection before the first glass. That setup work is the main trade-off here, since a drill or a plumber is part of the deal and the reward is filtered water you stop thinking about. Hardware is backed by a warranty of 1 to 2 years. Buyers shopping on running cost rather than sticker price should know that cartridges, not the system, are the recurring spend, and the next section sets out both figures. Beginners tend to focus on the purchase price alone, so it helps to read the filter numbers alongside the hardware price from the start.

Pricing

The entry figure for the reverse-osmosis system is $199.99. Paying for it is a straight purchase rather than a plan, so the entry price is what you hand over at the start and the recurring line is filters. The complete filter set costs $79.99, and the annual filter spend runs $40 to $80. That yearly number is the one most households should compare, because a cheaper system up front can cost more at the tap over the years. Entry price sits well inside the middle of the market range here, while annual filter cost sits at the cheap end, so the difference between paying once and paying repeatedly favours this brand. Households that drink bottled water or formula will use cartridges faster and should reread the yearly figure before ordering.

Where it sits among rivals

Ranked against the wider field, Filter United sits in the middle on what a system costs to buy and near the front on what the filters cost each year. Entry price ranks 29 of 52 brands, so you are paying around the middle of the group rather than the bottom or the top. Annual filter cost is the standout: 3 of 46 brands come after Filter United on yearly filter spend. Cartridge price is the weaker line at 35 of 50, which says the set itself looks full next to rivals that undercut it. Read the two together and the pattern is plain. Buyers who keep a system for years feel the cheap running cost far more often than they feel a full-priced cartridge set.

Who runs it

Filter United is a US company founded in 2021, which makes it a young operation next to filtration names with longer histories. Getting hold of them runs through email, chat and help centre: a help centre for written answers, live chat for quick questions, and email for anything that needs a paper trail. For a filtration system that may need plumbing advice, written support is workable, and buyers who prefer voice contact should keep that in mind before ordering. The company's shape explains its pitch. A younger, US-focused operation competes on certification, warranty and running cost rather than on history, which is why the price story reads well in the years after the purchase.

How Filter United compares

Frequently asked questions

What does a Filter United system cost to buy?+

The reverse-osmosis system carries an entry price of $199.99. Paying for it is a straight purchase, so the figure that comes back each year is the filter spend rather than a renewal fee. Plan the budget with both numbers: $199.99 at the start and $40 to $80 a year after that.

How much do replacement filters cost?+

The complete filter set is $79.99. Spread across ordinary household drinking water use, the yearly filter cost runs $40 to $80, which is the number most buyers should compare across brands. The set price sits at 35 of 50 brands on cartridge price, so it is not the cheapest sticker.

Is there a subscription or a renewal price?+

Filter United sells hardware and cartridges rather than a monthly plan, so the entry figure of $199.99 is what you pay at the start and $79.99 for the filter set is what recurs. There is no contract term to weigh up, and your running cost each year is $40 to $80.

What certification does the system carry?+

The system holds WQA Gold Seal certification, covering reverse osmosis performance and lead-free materials under the NSF/ANSI standards. The NSF/ANSI standard listed for the brand is 58. Buyers who check certificates before buying will find the claim attached to this system rather than a general promise.

Does it reduce PFAS and lead?+

Filter United states PFAS and lead reduction for the system. That claim sits alongside WQA Gold Seal certification covering reverse osmosis performance and lead-free materials, so the reduction claim and the material standard both appear in the product details. Read the two together: a stated reduction claim plus a certified material standard.

Do I have to install it myself?+

Installation is required. The system is reverse osmosis (reverse osmosis), so it needs a water connection and a drinking water tap rather than sitting on a counter like a jug. Budget an afternoon with a drill or a plumber before the first glass, and keep the warranty of 1 to 2 years in mind for the hardware once it is fitted.

Where does Filter United ship?+

The brand ships to US, so the range is built around that market. Buyers elsewhere should start with Culligan Consumer Products or look at a local filtration dealer instead. For anyone ordering within the market, delivery is straightforward, while installing a reverse-osmosis unit stays the part you plan for.

How long is the warranty?+

The warranty runs 1 to 2 years on the system itself. That covers the hardware rather than the cartridges, so keep a note of the filter schedule: the filter set is $79.99 and the yearly figure is $40 to $80. Replacement filters are an ongoing cost whichever brand you pick.

How do I reach support after buying?+

Support runs on email, chat and help centre, so a help centre, live chat and email cover most questions. Written answers suit plumbing and filter questions that benefit from something to come back to later. If you would rather talk to someone by voice during setup, weigh another brand before you commit to a system.

Sources

Compiled from 5 source pages, checked September 30, 2026. We did not open an account.

Not confirmed yet: Cartridge life (l).

Filter United

A certified reverse-osmosis system with low yearly filter cost for US households.

9.0/10See alternatives

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