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Innovative Air Quality Solutions
United States, Residential Water Treatment & PFAS Reduction

Helping a U.S. Water Treatment Provider Enter the PFAS Filtration Market

A U.S. water treatment provider approached HisoAir to explore a differentiated under-sink filtration offering for homeowners concerned about PFAS and other drinking-water contaminants. HisoAir introduced a certification-backed filtration platform that combines verified product-level claims, installer-friendly design, and a replacement-cartridge business opportunity. The client has ordered samples for technical evaluation and market research.

TARGET AUDIENCE

Water Treatment Brands & Professional Installers

SOLUTION AREA

Certified Residential Water Filtration

KEY TECH

IAPMO R&T–Listed Total PFAS Reduction

PRODUCTION

Sample Evaluation & Market Validation

Our Involvement

Under-Sink Filtration Platform Evaluation

PFAS Reduction & Certification Documentation

Product Specification and Application Review

Installation & Replacement-Cartridge Design

Private-Label and OEM Program Planning

Sample Coordination and Technical Validation Support

Manufacturing and Supply-Chain Planning

Long-Term Product Roadmap Discussion

Project Overview

Company

Confidential U.S. Water Treatment Provider

Headquarters

United States (location undisclosed)

Market

United States — Residential Water Treatment

Products

Under-Sink Filtration System; Replaceable Cartridge (WP3000(US) Platform Reference)

Background

The client is a U.S.-based water treatment provider serving homeowners through product distribution, professional installation, and residential water quality services.

For this type of business, product selection affects more than the initial sale. It also shapes customer trust, installation efficiency, and the quality of ongoing support.

As awareness of per- and polyfluoroalkyl substances (PFAS) and other drinking-water contaminants grew, the client identified an opportunity to move beyond conventional filtration products and introduce a more differentiated point-of-use water treatment offering.

The U.S. market contains numerous under-sink filters with similar appearances and broad performance claims. The client therefore wanted to evaluate a solution with clearly documented reduction claims, practical maintenance features, and a product platform that could fit its installation-led business model.

HisoAir was approached to help the client assess whether an existing filtration platform, supported by product-specific certification evidence and OEM/ODM resources, could provide a credible starting point for this expansion

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"For this project, the priority was not simply to add another water filter. It was to connect independently verified filtration claims with practical installation, convenient cartridge replacement, and a viable long-term service model."

The Idea

The idea was to create a premium residential under-sink water filtration offering that the client could confidently introduce through its existing distribution and professional installation channels.

Instead of beginning with an entirely new system design, the client could evaluate an established filtration platform first, then decide which elements required branding, accessory adjustments, or additional development.

This would provide a more practical path from product exploration to market validation.

The proposed offering needed to bring together several requirements:

Verifiable PFAS Reduction

Claims supported by third-party certification for an identified product and cartridge configuration.

Practical Residential Installation

A compact point-of-use system suited to under-sink spaces and professional installer workflows.

Straightforward Filter Replacement

A service-friendly cartridge interface that homeowners and technicians could manage over time.

A Repeatable Commercial Model

Opportunities for replacement-cartridge orders and long-term customer relationships, subject to market acceptance.

Room for Brand Development

Potential OEM/private-label packaging and product presentation, with certification implications evaluated separately.

HisoAir introduced its WP3000(US) under-sink filtration platform as the proposed technical reference.

Its existing filtration architecture and certification documentation offered the client a concrete system to assess, rather than a concept supported only by marketing claims.

The initial decision was deliberately limited: test samples, assess fit with the local market, and use those findings to determine whether to proceed with a branded product program.

The Challenge

Establishing Meaningful Product Differentiation

Many residential water filters compete on low price or generic claims.

The client needed a clear, defensible reason for homeowners and professional installers to consider a premium under-sink solution.

Communicating PFAS Reduction Responsibly

PFAS refers to a large family of chemicals.

A broad “PFAS removal” statement does not define which substances, conditions, or product configurations were evaluated.

The client needed product-specific evidence and guidance on using certification claims accurately in sales and marketing materials.

Matching Professional Installation Requirements

The system needed to fit realistic kitchen cabinet spaces and allow straightforward connection, inspection, and cartridge replacement.

A solution that complicates routine service can create costs for both installers and homeowners.

Evaluating the Economics of Replacement Filters

The client wanted to explore an ongoing cartridge-replacement business, but demand, service intervals, pricing, and customer acceptance had not yet been validated.

These factors needed review before establishing a full commercial program.

Controlling Market Entry Risk

A fully customized filtration system would introduce additional engineering, testing, certification, tooling, and inventory commitments.

The client needed a phased approach that allowed technical and market feedback to guide future investment.

The HisoAir Solution

HisoAir proposed a phased solution built around an existing under-sink filtration platform, third-party certification evidence, practical installation features, and flexible OEM/ODM cooperation.

The goal was to give the client a technically credible product to evaluate before making wider commercial commitments.

A Certification-Backed PFAS Filtration Platform

The WP3000(US) system with its specified WP3000(US)-RF replacement cartridge is listed by IAPMO R&T for applicable requirements of NSF/ANSI 42, NSF/ANSI 53, NSF/ANSI 401, and NSF/ANSI/CAN 372.

The NSF/ANSI 53 listing includes Total PFAS Reduction for the listed configuration.

The specified system has a rated flow of 1.5 GPM and a rated capacity of 3,000 gallons under its applicable certification listings.

These ratings and contaminant-reduction claims apply to the identified product configuration, not to every possible customized cartridge or assembly.

For the client, this meant evaluating a documented filtration platform rather than beginning with an untested concept.

HisoAir could support technical review with product specifications and references to the relevant certification documents.

Installation and Replacement Built into the Design

The proposed platform uses a compact under-sink format and a twist-lock replacement cartridge.

Its service-oriented design is intended to simplify routine cartridge changes and support professional installation workflows.

This matters for a provider whose customer experience includes installation and after-sales service.

Ease of access, cartridge compatibility, replacement instructions, and maintenance planning all influence whether the product fits the company’s existing operations.

From Equipment Sale to Cartridge-Service Opportunity

The cartridge architecture also creates the potential for repeat filter orders and long-term customer contact.

HisoAir discussed how a future replacement program might support dealer replenishment, scheduled service, and customer reminders.

This remains a potential business model rather than an achieved revenue result.

Replacement timing must follow the selected system’s specifications, water conditions, and actual usage.

OEM / Private-Label Development with Certification Discipline

HisoAir’s OEM/ODM support can cover product presentation, private-label discussions, packaging, selected accessories, technical documentation, and supply planning.

These options allow a water treatment brand to consider differentiation without committing to a completely new filtration architecture at the outset.

However, certification does not transfer automatically to a client-branded or modified system.

Any changes to filtration media, wetted materials, flow path, or connected cartridge arrangement may require separate evaluation or approval before equivalent certified claims can be used.

A Phased Evaluation Instead of a Premature Launch

The immediate cooperation focused on sample assessment and market research.

After reviewing the proposed product direction, the client placed a sample order to support technical testing and local-market evaluation.

This staged process gives both parties a practical basis for deciding on future branding, channel development, cartridge supply, and possible expansion into additional residential or commercial water treatment products.

The Results

The project progressed from an initial market-expansion discussion to a defined product evaluation step.

After technical exchanges and an assessment of the proposed filtration platform, the client ordered sample units for testing and market research.

This is an important but deliberately limited outcome.

The sample order confirms that the client moved beyond a general inquiry and chose to evaluate an actual product.

It does not establish that the system has been commercially launched, installed at scale, or adopted under a final private-label brand.

The evaluation now provides a basis for reviewing three practical questions:

Technical Fit

Does the product meet the client’s expectations for installation, maintenance, and usable product documentation?

Market Fit

Can the client position a certification-backed PFAS filtration solution appropriately for U.S. homeowners?

Commercial Fit

Is there sufficient opportunity to develop a replacement-cartridge program and, potentially, a broader OEM/private-label relationship?

The discussions also identified possible longer-term directions, including whole-house and commercial water treatment.

These remain future opportunities rather than confirmed product programs.

Current Project Status: Sample Evaluation and Market Validation.

The next commercial step will depend on the client’s test findings and market feedback.

Key Achievements Include:

☑ Identified a certification-backed residential under-sink filtration platform
☑ Reviewed product-specific IAPMO R&T Total PFAS Reduction documentation
☑ Defined practical installation and cartridge-replacement evaluation criteria
☑ Established a sample-testing and market-research next step
☑ Explored opportunities for recurring replacement-cartridge supply
☑ Opened discussions on future OEM/private-label and broader water treatment cooperation

Conclusion

This case demonstrates how a U.S. water treatment provider can approach the PFAS filtration market through structured product evaluation rather than an immediate commitment to full custom development.

HisoAir contributed an established under-sink filtration platform, product-specific certification references, installation-oriented engineering, and OEM/ODM support for potential future commercialization.

Together, these elements help the client evaluate both the technical suitability of the system and the long-term service opportunities associated with replaceable cartridges.

The project remains at the sample-testing and market-research stage.

Its value lies in providing a credible starting point for the client’s next decision: whether to proceed with a branded residential filtration program, refine the proposed solution, or explore adjacent water treatment categories.

For water treatment brands and professional installation partners, the wider lesson is clear: verifiable filtration claims, serviceable product design, and a disciplined development process are essential foundations for a sustainable product offering.

Our Involvement

Under-Sink Filtration Platform Evaluation

PFAS Reduction & Certification Documentation

Product Specification and Application Review

Installation & Replacement-Cartridge Design

Private-Label and OEM Program Planning

Sample Coordination and Technical Validation Support

Manufacturing and Supply-Chain Planning

Long-Term Product Roadmap Discussion

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Contaminant Engineering•3 min read

PFAS Water Filtration Technologies Explained: Carbon, Resin & RO

Key Takeaway:

PFAS reduction depends on the specific compounds present, treatment media, contact time, water chemistry, and system design. Activated carbon, ion exchange, and Reverse Osmosis address PFAS through different mechanisms.

PFAS are a large family of persistent fluorinated compounds that can occur in drinking-water supplies. Their treatment behavior varies significantly by molecular structure, chain length, functional group, concentration, and the chemistry of the source water.

Granular Activated Carbon (GAC) removes PFAS primarily through adsorption. It is generally more effective for many longer-chain PFAS, while shorter-chain compounds tend to break through more quickly. Carbon performance depends on media properties, Empty Bed Contact Time (EBCT), competing organic matter, loading, and replacement frequency.

Ion-exchange resins use charged functional sites to capture many PFAS compounds. Properly selected anion-exchange media can provide high capacity and may perform better than conventional activated carbon for some shorter-chain PFAS, although performance still depends on water chemistry and competing ions.

Reverse Osmosis (RO) uses membrane separation rather than adsorption. Properly designed RO systems can provide broad reduction across many PFAS compounds as well as dissolved salts and other contaminants. Unlike carbon or resin, however, RO also produces a concentrate stream that must be managed.

No single technology should be selected from a PFAS label alone. System design should consider which PFAS compounds are present, their concentrations, required reduction targets, flow rate, media life, and the applicable third-party certification or validation requirements.

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Match the treatment technology to your water quality first, then evaluate cabinet space, faucet configuration, flow rate, drain and power requirements, and filter replacement needs.

Choosing an under-sink water purifier starts with water chemistry. Carbon filtration is well suited to chlorine, taste, odor, and many organic contaminants, while Reverse Osmosis is more appropriate when dissolved salts, fluoride, nitrates, or broader dissolved contaminants need to be reduced.

For compact kitchens, tankless RO systems eliminate the conventional storage tank and can significantly reduce the space required under the sink. However, membrane capacity stated in GPD does not directly equal faucet flow. When comparing systems, check the actual dispensing flow rate, inlet-pressure requirement, recovery ratio, and whether a booster pump is required.

Installation architecture also matters. Many RO systems require a drain connection, electrical power, and either a dedicated drinking-water faucet or a compatible multi-function faucet. High-flow carbon systems can often connect directly to the existing cold-water line with a simpler installation, but pressure drop and available faucet flow should still be verified.

RO also removes much of the naturally occurring dissolved mineral content. Where taste or mineral balance is a priority, a post-RO remineralization stage can be added. Filter life should be evaluated by both rated capacity and local water quality rather than replacement time alone.

The right system is therefore not simply the smallest or highest-GPD model. It is the configuration that matches the target contaminants, available cabinet space, desired faucet setup, peak dispensing demand, and maintenance expectations.

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What Does TDS Mean in Drinking Water? Measurement vs Contaminant Reality

Key Takeaway:

A TDS meter estimates the overall concentration of dissolved ionic substances from electrical conductivity. It cannot identify specific contaminants or determine whether water is chemically safe.

Total Dissolved Solids (TDS) refers to the combined concentration of dissolved substances in water. Most handheld TDS meters do not measure TDS directly. Instead, they measure electrical conductivity (EC) and convert that reading into an estimated parts-per-million (ppm) value.

This means a TDS reading can indicate how much dissolved ionic material is present, but not what that material actually is. Calcium, magnesium, sodium, nitrates, and other dissolved ions can all contribute to conductivity, yet a simple TDS meter cannot distinguish between them.

TDS meters are also not suitable for detecting trace contaminants such as PFAS, many VOCs, pesticides, pharmaceuticals, or disinfection byproducts. These substances may be present at concentrations far below the level needed to noticeably change electrical conductivity.

A low TDS reading therefore does not guarantee safe drinking water, and a higher TDS reading does not automatically indicate contamination. Water-treatment decisions should be based on laboratory testing for specific contaminants of concern rather than TDS alone.

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Key Takeaway:

Ultrafiltration can reduce bacteria, turbidity, and suspended particles while retaining most naturally occurring dissolved minerals. Reverse Osmosis provides much broader reduction of dissolved salts and smaller contaminants.

Ultrafiltration (UF) typically uses hollow-fiber membranes with pore sizes in the approximate 0.01–0.1 micron range. These membranes physically retain turbidity, suspended solids, colloids, and many microorganisms while allowing dissolved minerals and salts to remain in the water.

Reverse Osmosis (RO) operates at a much finer separation level. Unlike UF, RO can substantially reduce dissolved ions such as sodium, calcium, fluoride, nitrates, and other contributors to total dissolved solids (TDS). This makes RO more suitable when dissolved-salt reduction is a primary treatment objective.

UF generally requires less system pressure and produces little or no continuous concentrate stream in many point-of-use configurations. RO typically requires greater pressure and produces a reject-water stream, but delivers broader contaminant reduction.

For water with acceptable TDS and mineral content, UF can be a simpler mineral-retaining treatment option. Where dissolved salts, fluoride, nitrates, or broader dissolved contaminants are a concern, RO is generally the more appropriate technology.

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Key Takeaway:

Choose RO for dissolved inorganic salts and heavy metals; choose Carbon Block for chemical taste/odor, no wastewater, and high line-pressure flow.

Reverse Osmosis (RO) and Carbon Block filtration represent two fundamentally different treatment methods: membrane separation and adsorption. Understanding these differences helps determine which technology is better suited to a specific water-quality requirement.

Reverse Osmosis uses a semi-permeable membrane with pore sizes of approximately 0.0001 microns. It can significantly reduce dissolved inorganic contaminants such as TDS, fluoride, nitrates, and certain heavy metals. Because water must be forced through the membrane, RO systems require sufficient pressure or a booster pump and generate a concentrated wastewater stream.

Carbon Block filtration relies primarily on adsorption through compressed activated carbon, commonly with nominal pore sizes around 0.5–5 microns. It is highly effective for chlorine, chloramines, VOCs, taste, and odor, while allowing substantially higher direct-flow rates without producing wastewater.

From an operating perspective, Carbon Block systems are generally simpler, require less energy, and avoid the water loss associated with RO. RO involves higher system complexity and operating cost, but provides substantially broader reduction of dissolved contaminants that Carbon Block alone cannot address.

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