Envirolyte ANW anolyte generators are on-site hypochlorous acid generator systems designed to produce neutral anolyte with lower salt and energy consumption than standard ELA anolyte machines. ANW systems are suitable for projects where low chloride residue, controlled dosing and reduced operating consumption are important selection criteria.
ANW generators produce ANK neutral anolyte, a HOCl-rich disinfectant solution, from water, salt and electricity. The standard output specification is approximately 500 ppm FAC with pH around 7–7.5, while optional pH regulation can be specified for applications requiring a wider operating range.
The ANW range is especially relevant for municipal water treatment, healthcare, industrial sanitation, cooling towers, cooling water disinfection and other applications where high hygiene performance is required with reduced salt residue and lower corrosion risk.
For applications requiring different FAC levels, catholyte production or system capacities, explore the full range of Envirolyte generation systems.
Low-Salt Anolyte Generation for Demanding Applications
Envirolyte ANW anolyte machines are designed to produce anolyte using less salt and energy. Approximately 1.5 g of NaCl and about 4 W of energy are required to generate 1 L of anolyte with approximately 500 ppm of FAC. This is about five times less salt and about 2.5 times less energy compared with standard ELA machines.
Reduced salt and energy consumption is important for markets such as municipal water treatment, healthcare and industrial applications where high sanitation performance is required with no or very low salt residue. It is also important where corrosion risk must be reduced and the chloride content in treated water should be kept to a minimum, for example in cooling towers and cooling water disinfection.
ANW Generator Installation
Key Differences Between ANW and Standard ELA Generators
| Parameter | ANW generator specification | Application relevance |
|---|---|---|
| Salt consumption | Approximately 1.2–1.5 g NaCl per 1 L of 500 ppm HClO / HOCl solution. | Supports low-salt operation and reduced chloride residue in treated water. |
| Energy consumption | About 4 W per 1 L of anolyte at approximately 500 ppm FAC, depending on model and operating conditions. | Useful for large water treatment and continuous dosing applications. |
| Standard pH | Generally pH ~7–7.5, depending on source water. | Supports neutral anolyte applications where low corrosivity and process compatibility matter. |
| Optional pH regulation | Optional pH regulation in the range of approximately pH 2.5–7.5 can be specified when ordering. | Allows the system to be configured for specific disinfection, water treatment or process requirements. |
| Catholyte production | ANW machines do not produce catholyte as a commercially viable side product; catholyte flow is approximately 0.4% of total flow. | If a process requires useful catholyte output, consider a standard ELA generator or a dedicated CG catholyte generator. |
How ANW Anolyte Generators Work
ANW systems use electrochemical activation technology to convert a dilute NaCl solution into an active oxidizing anolyte stream. The generated solution contains free available chlorine species, predominantly hypochlorous acid under suitable pH conditions, and is produced on site close to the point of use.
For technical background, see electrochemical activation and electrolysed water technology, diaphragmatic electrolysis cells and electrolysed water solutions.
When to Choose ANW Instead of ELA
ANW generators should be considered when the project requires neutral anolyte, lower salt consumption, lower energy consumption and reduced chloride residue. This can be important for continuous water disinfection, cooling tower treatment, corrosion-sensitive installations, healthcare water systems and industrial hygiene processes.
If your application requires a significant catholyte stream for alkaline washing or cleaning support, Envirolyte recommends evaluating a standard ELA anolyte generator or a dedicated CG catholyte generator.
Typical Applications
| Application area | Why ANW is relevant | Recommended page |
|---|---|---|
| Municipal and process water disinfection | Low-salt neutral anolyte for controlled dosing into water systems. | Water disinfection systems |
| Legionella risk management | Continuous treatment support for hot and cold water systems where dosing control and low residue are important. | Legionella prevention |
| Cooling towers and cooling water | Biofilm, algae and microbial control support with reduced chloride input and reduced corrosion risk. | Cooling towers |
| Healthcare and public buildings | On-site generation of neutral anolyte for water hygiene programmes and controlled disinfection workflows. | Healthcare water hygiene and Legionella control |
| Food processing and industrial hygiene | Process hygiene support where water quality, residue, contact time and material compatibility must be evaluated. | Food processing |
| Industrial applications | Water treatment, process hygiene and microbial control applications where lower salt residue is preferred. | Industrial applications |
ANW Generator Model Range
The ANW range includes wall-mounted and floor-standing generators. Model selection should be based on required output capacity, target FAC concentration, water quality, pH requirement, dosing method, storage volume, monitoring system, installation space and applicable local regulations.
| Model | Typical output at ~500 ppm FAC | Configuration | Technical data sheet |
|---|---|---|---|
| ela200ANW | ~20 LPH | Wall-mounted | PDF technical description |
| ela400ANW | ~40 LPH | Wall-mounted | PDF technical description |
| ela900ANW | ~90 LPH | Wall-mounted | PDF technical description |
| ela1200ANW | ~120 LPH | Wall-mounted | PDF technical description |
| ela2000ANW | ~200 LPH | Wall-mounted | PDF technical description |
| ela3000ANW | ~300 LPH | Wall-mounted | PDF technical description |
| ela4000ANW | ~400 LPH | Wall-mounted | PDF technical description |
| ela6000ANW | ~600 LPH | Floor-standing | PDF technical description |
| ela10000ANW | ~1000 LPH | Floor-standing | PDF technical description |
| ela12000ANW | ~1200 LPH | Floor-standing | PDF technical description |
| ela18000ANW | ~1800 LPH | Floor-standing | PDF technical description |
| ela20000ANW | ~2000 LPH | Floor-standing | PDF technical description |
| ela24000ANW | ~2400 LPH | Floor-standing | PDF technical description |
| ela30000ANW | ~3000 LPH | Floor-standing | PDF technical description |
| ela40000ANW | ~4000 LPH | Floor-standing | PDF technical description |
| ela50000ANW | Project-specific high-capacity configuration | Floor-standing | Technical data on request |
| ela60000ANW | Project-specific high-capacity configuration | Floor-standing | Technical data on request |
Wall-Mounted ANW Generators
Floor-Standing ANW Generators
ela50000ANW
ela60000ANW
Technical Features
- On-site production of ANK neutral anolyte with approximately 500 ppm FAC.
- Standard pH around 7–7.5, depending on source water.
- Optional pH correction in the range of approximately pH 2.5–7.5 when specified at order stage.
- Lower NaCl consumption compared with standard ELA machines.
- Reduced catholyte flow compared with standard anolyte generators.
- Automated flushing, acid pump, brine pump, input valve, flow and pressure controls, and temperature switches on cells according to model configuration.
- Remote control options through Ethernet, Modbus TCP/IP or GSM are available for selected configurations.
- Inline pH sensor, inline ORP sensor and non-contact level sensor options are available depending on project requirements.
Testing, Compliance and Project Evaluation
For engineering evaluation, Envirolyte provides supporting information on microbiological testing, by-products testing, Legionella prevention evidence, product comparison, quality control and regulatory context. These materials help customers evaluate whether ANW anolyte generation is suitable for a specific water treatment or sanitation programme.
Frequently Asked Questions
An ANW anolyte generator is an Envirolyte on-site generator designed to produce neutral HOCl-rich anolyte with lower salt and energy consumption compared with standard ELA anolyte generators.
ANW anolyte is an electrochemically activated oxidizing solution containing free available chlorine species. Under suitable pH conditions, hypochlorous acid is the key active species responsible for disinfection performance.
The standard ANW specification is generally around pH 7–7.5, depending on source water. Optional pH regulation in the range of approximately pH 2.5–7.5 can be specified when ordering.
ANW generators do not produce catholyte as a commercially viable side product. The catholyte flow is approximately 0.4% of total flow and is normally not selected when useful catholyte production is required.
Choose ANW when low salt consumption, low chloride residue, neutral anolyte and reduced corrosion risk are more important than catholyte production. Choose ELA or a dedicated CG catholyte generator if your application requires a significant alkaline catholyte stream.
Request ANW Generator Selection Support
For application guidance, technical data, installation requirements or model selection, send your enquiry to Envirolyte Industries International Ltd. Envirolyte can help evaluate water quality, required output, FAC concentration, pH range, dosing method, monitoring system and the most suitable generator configuration.
