Chlorine’s most effective form
Hypochlorous acid is the most effective disinfecting form of chlorine in water; it passes readily through microbial cell walls.
On-site generation system
AquaSky
An electrochemical activation system that makes hypochlorous acid at your facility from salt, water and electricity. HOCl at the anode, sodium hydroxide (caustic) at the cathode.
One system, two products
At the heart of AquaSky is a diaphragm electrolysis cell. As brine passes through it, direct current drives two separate reactions at the two electrodes, and the diaphragm keeps the two products apart.
The anode side yields a hypochlorous acid (HOCl)-dominant oxidant solution for disinfection; the cathode side yields sodium hydroxide (NaOH, caustic). HOCl is the main product; NaOH is a second output that can be put to use on site.
Skytech Water sizes AquaSky to your facility, installs it, commissions it and services it.
Anode (+) HOCl Hypochlorous acid-dominant oxidant · main product
Cathode (−) NaOH Sodium hydroxide · caustic · second product
Inputs Salt · Water · Power No hazardous chemical transport or storage
Production On demand Starts and stops with measured demand
01
Inside the cell
The section below shows what happens at the anode and the cathode, what the diaphragm does, and where the two products leave the cell.
Anode side · HOCl
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Anode (+)
The positive electrode. Chloride ions (Cl⁻) give up electrons here; the chlorine formed reacts with water to give hypochlorous acid (HOCl).
2Cl⁻ → Cl₂ + 2e⁻ · Cl₂ + H₂O → HOCl + HCl
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HOCl outlet · anolyte
The main product: an oxidant solution dominated by hypochlorous acid, sent to the tank and dosing line for disinfection.
Cathode side · NaOH
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Cathode (−)
The negative electrode. Water molecules take up electrons, forming hydrogen gas and hydroxide ions (OH⁻). OH⁻ combines with Na⁺ arriving through the diaphragm to form sodium hydroxide (NaOH).
2H₂O + 2e⁻ → H₂↑ + 2OH⁻ · Na⁺ + OH⁻ → NaOH
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NaOH outlet · catholyte
The second product: sodium hydroxide (caustic). It can be used on site for alkaline cleaning (CIP) and pH correction.
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H₂ vent
Hydrogen released at the cathode is separated and vented in a controlled way.
Cell
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Diaphragm
Separates the anode and cathode chambers. It lets sodium ions (Na⁺) pass to the cathode while keeping the two products apart.
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Brine inlet
Softened water and sodium chloride (NaCl) solution are fed to both chambers.
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DC power supply
Drives direct current through the cell; output is matched to the measured demand.
02
Anode: hypochlorous acid (HOCl)
At the anode, chloride ions are oxidised to chlorine, which reacts with water to form hypochlorous acid. This is the system’s main product.
Fresh, on site
The solution is made where and when it is used. No loss of strength on the shelf and no chemical stock.
Measured dosing
HOCl collects in a tank; the dosing pump feeds it into the main line according to flow and free-chlorine readings.
03
Cathode: sodium hydroxide (NaOH)
At the cathode, water splits into hydrogen and hydroxide ions; combined with the sodium that crosses the diaphragm, this forms sodium hydroxide (caustic).
Alkaline cleaning
The caustic can serve as the alkaline wash step in CIP circuits and equipment cleaning, followed by disinfection with HOCl.
pH correction
Where the process allows, it can be used to raise the pH of water.
Collected separately
NaOH collects in its own tank and never mixes with the HOCl. How it is used is defined in the project around the facility’s processes.
04
System flow
The components of an AquaSky installation, from feed water to the dosing point. Layouts differ by site; components are selected per project.
- Mains / main line
- Feed water
- Brine
- HOCl (anolyte)
- NaOH (catholyte)
- Measurement and control signal
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Main line
The network, reservoir or process line to be disinfected.
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Feed
Water taken into the system through a valve and pressure regulator.
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Mechanical filter
Holds back suspended particles to protect the cell.
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Water softener
Removes hardness and prevents scaling on the electrodes.
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Brine tank
Sodium chloride (NaCl) solution is prepared and fed to the cell.
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AquaSky unit
Diaphragm electrolysis cell: HOCl at the anode, NaOH at the cathode.
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HOCl tank
Anolyte collects in a tank with level sensors; production restarts as the level drops.
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NaOH tank
Catholyte (caustic) collects in a separate tank.
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Dosing pump
Injects HOCl into the main line according to measured demand.
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Flow meter
Measures line flow; dosing is set in proportion to it.
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Residual chlorine / ORP
Free chlorine or redox is measured after dosing and the dose is corrected accordingly.
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Control and remote monitoring
Measurement, production and dosing data are tracked on one panel and remotely.
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H₂ vent
Hydrogen gas is vented safely.
05
The system
Production on demand
Production starts when the HOCl tank level drops and stops when it is full.
Automatic dosing
The dose is continuously corrected from flow and residual chlorine / ORP readings.
Remote monitoring
Production, dosing and cell status are tracked on the panel and remotely; fault alerts are sent instantly.
Safe operation
Hydrogen formed at the cathode is vented in a controlled way; no hazardous chemical stock is kept on site.
06
Sizing
Capacity, salt and energy figures are sized for each facility. Contact our technical team to receive the configuration and technical values for your site.
Request technical values07
Applications
Drinking Water
In drinking water the task is maintaining microbiological safety at every point of the network, not only at the source. On-site hypochlorous acid dosing is built for exactly that.
Swimming Pools
In pool operation, most complaints come not from chlorine itself but from its by-products. On-site generation strengthens disinfection while reducing by-products.
Healthcare
In healthcare facilities, water is a matter of both patient safety and infection control. Hot-water lines, cooling towers and surfaces are parts of a single hygiene chain.
Food Processing
In food safety, water is both a raw material and a cleaning agent. In both roles, disinfection must be effective yet residue-free.
Agriculture & Greenhouses
Efficient irrigation runs through clean lines. Disinfection keeps lines open and emitters delivering water evenly across the field.
Livestock
Herd health begins with a clean water line. Biofilm in drinking lines is an invisible but constant source of risk.
Industrial Plants
In industry, water is both a cost and a risk item. Controlling biofilm protects equipment and people; producing chemicals on site simplifies supply.
Surface Disinfection
A good surface disinfectant must be as safe as it is effective. On-site hypochlorous acid delivers both.
SSS
Frequently asked questions
What does AquaSky produce?
AquaSky produces two separate products in a diaphragm electrolysis cell: a hypochlorous acid (HOCl)-dominant oxidant solution on the anode side and sodium hydroxide (NaOH) on the cathode side. HOCl is the main product, used for disinfection.
What is the NaOH from the cathode used for?
The sodium hydroxide (caustic) collects in a separate tank. It can be used on site for alkaline cleaning and CIP steps, or for pH correction where the process allows. How it is used is defined in the project.
Why does the diaphragm matter?
The diaphragm separates the anode and cathode chambers. It lets sodium ions pass while keeping HOCl and NaOH from mixing, so the two products can be drawn off separately.
Which capacity suits my facility?
Capacity is sized to the facility’s daily water volume, target dose and points of use. Contact our technical team for technical values.
How is the hydrogen from the cell handled?
Hydrogen released at the cathode is separated and vented in a controlled way. Installation location and ventilation are defined in the project before commissioning.
Request sizing for AquaSky.
Share your daily water volume and application; we will define the right AquaSky configuration for your facility together.