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Sodium hypochlorite is a liquid chlorine-based chemical used in water treatment to control microorganisms and support disinfection. Selecting a product is not simply a matter of choosing the highest concentration. The required strength, water-treatment process, dosing equipment, storage conditions, quality requirements and site procedure all need to agree.
Online Reagents supplies sodium hypochlorite solutions from 0.5% through to 12–14% LR in a range of pack sizes. This guide explains the application, the main selection checks and how to request the appropriate product online.
What is sodium hypochlorite?
Sodium hypochlorite is an aqueous solution commonly associated with bleaching and disinfection. The UK Health Security Agency identifies disinfection of public water supplies as one of its important applications. In water, chlorine chemistry produces hypochlorous acid and hypochlorite ions. These form part of the free available chlorine used in a controlled disinfection process.
The chemical is supplied at different concentrations because different systems and duties have different requirements. The product concentration is only one part of the specification: the treatment objective, required quality, equipment and approved operating procedure determine what is suitable.
How sodium hypochlorite supports water disinfection
Water disinfection is used to reduce harmful microorganisms and manage microbiological risk. The Drinking Water Inspectorate explains that chlorination is used throughout the world and can be achieved with sodium hypochlorite solution, calcium hypochlorite or chlorine gas. Sodium hypochlorite provides a liquid option that can be stored and dosed through suitable equipment.
Performance depends on the complete treatment arrangement. Water quality, pH, chlorine demand, contact time, flow, the condition of dosing equipment and the target residual all affect the result. A product should therefore be selected and used under the site’s approved water-safety plan, risk assessment and operating procedure. This article is selection guidance, not a dosing instruction.
Where the application is used
Sodium hypochlorite can form part of public, private and industrial water-treatment systems. The duty may include primary disinfection, maintaining a controlled residual within a distribution system, or treating water used by an industrial process. The correct product and approval route depend on the intended use.
For drinking-water applications in the UK, buyers must check the relevant regulatory and quality requirements rather than assume that any sodium hypochlorite solution is suitable. The Drinking Water Inspectorate notes that substances used in treatment must not create a risk to public health and publishes specific guidance for private supplies and water companies.
Why concentration matters
Concentration affects product handling, storage, consumption and the way a dosing system is configured. A stronger solution is not automatically better. It may be unsuitable for the equipment, process or storage conditions, and an unapproved substitution can change the amount of available chlorine delivered.
Start with the concentration stated by the process designer, equipment supplier or approved site procedure. Confirm whether the specification is expressed as sodium hypochlorite, available chlorine or another basis, because these descriptions should not be treated as interchangeable without technical review. If the requirement is unclear, provide the application and existing product details when requesting a quotation.
Sodium hypochlorite solutions available online
The current Online Reagents range contains the following orderable products:
- Sodium Hypochlorite Solution 0.5%
- Sodium Hypochlorite Solution 1%
- Sodium Hypochlorite Solution 3%
- Sodium Hypochlorite Solution 5%
- Sodium Hypochlorite Solution 10%
- Sodium Hypochlorite 12–14% (LR)
Product pages list pack sizes from 500 ml to 25 L, with bulk quantities, custom bottling and white-labelling options also available for discussion. Select the required product, enter the pack size and quantity, then add it to the quote basket. Pricing, availability and delivery are confirmed in the formal quotation.
Storage and product age affect performance
Sodium hypochlorite does not remain unchanged indefinitely. The Drinking Water Inspectorate advises that decomposition, particularly when a solution is exposed to light, reduces available chlorine and increases chlorate relative to chlorine. Age, concentration and temperature can influence that process.
Plan order frequency and pack size around realistic consumption. Store the product in accordance with its current safety data sheet and the site’s chemical-storage controls. Do not carry forward an old dosing assumption when the supplied concentration, product age or process conditions change.
Safety and compatibility checks
Sodium hypochlorite is a hazardous chemical and the classification of a supplied mixture depends on its concentration and formulation. Consult the product label and current safety data sheet before handling, storage or use. Appropriate training, segregation, ventilation, containment and personal protective equipment should follow the site’s COSHH assessment.
Never mix sodium hypochlorite with acids or ammonia-based products. UKHSA states that acids can release chlorine gas and ammonia-based solutions can form chloramines, both of which can cause serious respiratory harm. Confirm material compatibility throughout the dosing and storage system, including tanks, pumps, pipework, seals and bunding.
Information to include with an online request
A complete request helps the team confirm the correct commercial and technical details. Include:
- the required sodium hypochlorite concentration and how it is expressed;
- the intended application and whether the water is drinking, process or wastewater;
- the current product name, specification and supplier part number where available;
- the required pack size and number of packs;
- estimated consumption and delivery frequency;
- any certificate, specification or traceability requirements;
- relevant equipment and material-compatibility details.
If the treatment specification has not yet been defined, consult the system designer, responsible water-treatment specialist or appropriate regulator before ordering. Online Reagents can discuss the product range, but the site owner remains responsible for approving the treatment process and conditions of use.
Frequently asked questions
Is sodium hypochlorite used to disinfect water?
Yes. Sodium hypochlorite is one of the chlorine-based products used in controlled water-disinfection processes. Suitability and dosing must be established for the specific water, system and regulatory context.
Which concentration should I order?
Use the concentration specified by the process designer, equipment supplier or approved site procedure. Do not substitute a different strength without checking the dosing calculation, equipment and approval requirements.
Does a higher concentration work better?
Not automatically. The correct strength is the one the treatment system and procedure are designed to use. Higher concentration can alter handling, storage, degradation and dosing requirements.
Can sodium hypochlorite be mixed with other cleaners?
No general mixing assumption is safe. In particular, never mix it with acids or ammonia-based products because hazardous gases can be produced. Follow the safety data sheet and site chemical controls.
Authoritative guidance
Request sodium hypochlorite online
Browse the full sodium hypochlorite range, select the specified concentration and enter the pack size and quantity you require. If you are replacing an existing product, include its specification and current pack details so the team can review the request accurately.
