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Innovative Air Quality Solutions
Air & Water Purification · Global B2B Sourcing · Industry Practitioner

Alwen Lee

Founder & Head of Product Strategy

HisoAir / Welltronix

I work at the intersection of product strategy, purification technology, and global manufacturing, helping brands and enterprise partners turn complex air and water systems into scalable, compliant, and real-world products.
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What I Do

Bridging Technology, Manufacturing & Global Markets

I’m the founder of HisoAir / Welltronix, focusing on product strategy and industry direction in air and water purification.

With over a decade of hands-on experience across OEM/ODM manufacturing, supplier audits, and global client projects, my role is not to manage individual features — but to define what products should be built, which technologies are worth investing in, and how those products can be manufactured, certified, and scaled for global markets.

I work closely with engineering teams, manufacturing partners, and international clients to bridge the gap between technical feasibility, supply chain reality, and long-term product vision.

Product Strategy
Defining what to build and why
Manufacturing
OEM/ODM expertise & supplier networks
Global Scaling
Certification & market expansion
Real-World Documentation

Documenting Real-World Work

Rather than creating content for marketing purposes, I document real-world industry practice — including sourcing trips, supplier visits, technical discussions, trade shows, and global client engagements.
Supplier Audits
Factory visits across China and Southeast Asia
Joint Sourcing
International partner trips during major trade fairs
Technical Discussions
OEM partners on materials, components, manufacturability
Global Engagements
Client visits in Europe and the United States
  Technical Expertise  

Air & Water Purification Technology Insights

I regularly share practical insights on air and water purification technologies, focusing on real-world trade-offs rather than theoretical claims. These insights are drawn directly from product development work, factory validation, and client projects.

Filtration structure and material selection
Noise control and airflow design
Sensor integration and system reliability
Manufacturing constraints that impact product performance
Diagram showing the components of an air purifier filter with arrows indicating airflow through layers.
Industry Presence

Trade Shows & Industry Events

I actively participate in major global industry events to stay close to market trends and emerging technologies.

CES

Las Vegas
Consumer Electronics

AWE

Shanghai
Appliance & Electronics

Canton Fair

Guangzhou
Import & Export

Regional Shows

Asia, Europe, NA
Industry Events

Patents & Technical Contributions 

I hold multiple patents related to air purification and product structure, reflecting long-term involvement in engineering-driven product development.

System performance and reliability
Noise reduction and airflow efficiency
Practical implementation of purification technologies

Additional technical details are available upon request.

Editorial & Industry Responsibility

In addition to product strategy, I serve as an editorial and technical reviewer for selected industry and technical articles.

This role ensures that published content reflects:

Accurate technical understanding
Manufacturing and compliance realities
Practical relevance for B2B and enterprise applications

Public Documentation

Where I Share & Document My Work

I maintain public records of my work and field experience across multiple platforms. These platforms serve as ongoing documentation, not promotional feeds.

Let's Connect

Interested in collaboration, sourcing partnerships, or technical discussions? I'm always open to connecting with industry professionals and enterprise partners.

Email

alwen@hisomedical.com

Company

www.hisoair.com

Connect on LinkedIn
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.

HisoAir Water Technical Series
Product Discovery•3 min read

How to Choose an Under-Sink Water Purifier for Modern Kitchens

Key Takeaway:

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.

HisoAir Water Technical Series
Water Quality•2 min read

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.

HisoAir Water Technical Series
Technology Selection•2 min read

RO vs UF Water Filtration: Understanding Pore Sizes & Dissolved Minerals

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.

HisoAir Water Technical Series
Technology Selection•4 min read

Carbon Block vs Reverse Osmosis: Which Fits Your Need?

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.

HisoAir Water Technical Series

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