Product Description

Fernox DS-3 Limescale Remover 2kg

Product Code: 61027

Remove stubborn scale from suitable water heaters and heating components with the Fernox DS-3 Limescale Remover 2kg. This powerful sulphamic-acid descaler dissolves baked-on limescale and helps restore lost operating efficiency.

Fernox adds corrosion inhibitors to help protect compatible materials during cleaning. In addition, the built-in colour indicator shows when the solution has used its descaling power.

DS-3 can dissolve up to 50% of its own weight in limescale. Therefore, this 2kg container provides an effective solution for heavily scaled equipment and larger maintenance jobs.

Key Features

• Powerful sulphamic-acid limescale remover
• Supplied in a 2kg container
• Removes stubborn and baked-on limescale
• Dissolves up to 50% of its own weight in scale
• Helps restore water-heater efficiency
• Suitable for compatible boiler heat exchangers
• Corrosion-inhibited formulation
• Built-in colour-change indicator
• Changes from yellow through green to blue as it becomes exhausted
• Works faster when mixed with hot water
• Suitable for many common plumbing materials
• Belgaqua-approved product
• Professional-strength cleaning product
• Product code: 61027

Fernox DS-3 Specification

• Download the Fernox DS-3 Technical Data Sheet
• Download the Fernox DS-3 Safety Data Sheet
• Brand: Fernox
• Product: DS-3 Limescale Remover
• Product type: sulphamic-acid descaler
• Pack size: 2kg
• Formulation: sulphamic acid with inhibitors, indicators and non-foaming surfactants
• Maximum mixing concentration: 1kg per 10 litres of water
• Minimum in-use concentration: 250g per 10 litres of water
• Maximum solution temperature: 80°C
• Colour indicator: yellow, green and blue
• Maximum scale-dissolving capacity: up to 50% of the product’s own weight
• Approval: Belgaqua approved
• Product code: 61027

What Is Included?

• 1 x 2kg container of Fernox DS-3 Limescale Remover
• Application and safety information shown on the packaging

Suitable Applications

Fernox designed DS-3 to remove limescale from compatible water heaters and heating components. Typical applications may include:

• Domestic water heaters
• Compatible boiler heat exchangers
• Hot-water cylinders
• Immersion heaters
• Hot-water pipework
• Compatible taps and plumbing fittings
• Suitable appliances affected by hard-water scale

Always check the equipment manufacturer’s instructions before descaling. In addition, confirm that every material in contact with the solution is compatible with DS-3.

Compatible Materials

Fernox lists DS-3 as suitable for use with several common plumbing materials, including:

• Steel
• Stainless steel
• Cast iron
• Copper
• Brass
• PVC
• ABS
• Rubber
• Polythene
• Most plastic pipework

However, the complete appliance may contain seals, coatings or other parts that react differently. Therefore, always check with the appliance manufacturer when you are unsure.

Important Material Restrictions

Do not use Fernox DS-3 on unsuitable materials or finishes. Fernox states that DS-3 should not be used with:

• Thin-gauge aluminium
• Badly corroded aluminium
• Zinc
• Galvanised steel
• Acrylic surfaces
• Plastic acrylic kettles or baths
• Chromium-plated surfaces
• Enamelled surfaces
• Concrete
• Asbestos-containing materials

If you cannot confirm the construction of the appliance or component, contact its manufacturer before using the descaler.

How Fernox DS-3 Works

Hard water leaves calcium-based scale inside water heaters, heat exchangers and hot-water components. Over time, this deposit can reduce water flow and restrict heat transfer.

Fernox DS-3 uses sulphamic acid to dissolve these hard deposits. Meanwhile, corrosion inhibitors help protect compatible metal surfaces during treatment.

As a result, correct descaling can improve heat transfer and help restore the efficiency of affected equipment.

Mixing Fernox DS-3

First, dissolve the required amount of DS-3 in hot water. Use a concentration between the following limits:

• Maximum concentration: 1kg of DS-3 per 10 litres of water
• Minimum concentration: 250g of DS-3 per 10 litres of water
• Maximum solution temperature: 80°C

Hot water speeds up the descaling process. However, do not heat the solution above 80°C.

The chemical reaction releases carbon dioxide and may produce foam. Therefore, always leave enough empty space in the container or system before starting the treatment.

Colour-Change Indicator

Fernox DS-3 changes colour as it dissolves limescale. This feature helps you monitor the strength of the solution:

• Yellow: the solution still has active descaling power
• Green: most of the descaling power has been used
• Blue: the solution is exhausted

The final change to blue may take longer when the solution is cold. Therefore, do not rely on colour alone without also checking the equipment and following the application instructions.

General Application Guidance

1. Read the technical and safety data sheets before starting.
2. Switch off the appliance and isolate its power or fuel supply.
3. Allow the appliance or system to cool to a safe working temperature.
4. Confirm that all materials suit Fernox DS-3.
5. Dissolve the required quantity in hot water.
6. Do not exceed the maximum concentration or temperature.
7. Leave enough space for gas release and foaming.
8. Introduce or circulate the solution according to the equipment instructions.
9. Monitor the colour of the solution during treatment.
10. Drain the used solution when descaling is complete.
11. Rinse the equipment several times with clean water.
12. Continue rinsing until no product residue or odour remains.
13. Return the appliance to service only after completing all checks.

Heating systems and water-storage equipment can require specialist isolation, filling and flushing procedures. Therefore, a suitably qualified engineer should carry out the work where necessary.

Neutralising and Disposal

Fernox DS-3 is a hazardous acidic product. Therefore, handle and dispose of the used solution carefully.

Fernox System Neutraliser can neutralise the solution before disposal. Always follow the current safety data sheet, local waste rules and the appliance manufacturer’s instructions.

Do not dispose of concentrated or unneutralised product without first confirming the correct procedure.

Safety Information

• Read the product label before use
• Read the latest Fernox safety data sheet
• Keep out of reach of children
• Wear suitable protective gloves
• Wear suitable eye and face protection
• Avoid breathing dust or vapour
• Avoid contact with skin and eyes
• Use the product in a well-ventilated area
• Do not mix with other cleaning chemicals
• Allow space for carbon-dioxide release and foaming
• Rinse treated equipment thoroughly after descaling
• Store the product securely in its original container

If exposure occurs, follow the first-aid instructions shown on the packaging and in the current safety data sheet.

Why Remove Limescale?

Limescale can coat heating surfaces and reduce heat transfer. As a result, appliances may take longer to heat water and can use more energy.

Scale may also restrict waterways and place extra strain on components. Therefore, removing established deposits can support water flow, improve performance and extend the useful life of suitable equipment.

Why Choose Fernox DS-3?

Fernox DS-3 combines powerful scale removal with a corrosion-inhibited formula. It can dissolve a large amount of limescale and works with many common plumbing materials.

Furthermore, the colour-change indicator makes it easier to see when the solution has lost its cleaning power. The 2kg container also suits larger jobs and heavily scaled equipment.

Why Buy from SNH Tradecentre?

• Independent plumbing and heating merchant
• Established family-run business
• Competitive prices on Fernox products
• Helpful product and technical information
• Fast nationwide delivery options
• Collection available from our Birchington trade counter
• Trade and public customers welcome
• Secure online ordering
• Support before and after your purchase

SNH Tradecentre supplies Fernox products to professional installers, maintenance teams and domestic customers. Therefore, our team can help you find the right cleaner, inhibitor or related water-treatment product for your job.

Frequently Asked Questions

What is Fernox DS-3?

Fernox DS-3 is a sulphamic-acid limescale remover. It dissolves stubborn scale from compatible water heaters, heat exchangers and plumbing components.

How much Fernox DS-3 does this container hold?

This product contains 2kg of Fernox DS-3.

How much limescale can DS-3 dissolve?

Fernox states that DS-3 can dissolve up to 50% of its own weight in limescale. Therefore, a 2kg pack can dissolve up to approximately 1kg of scale under suitable conditions.

What is the correct mixing ratio?

Use between 250g and 1kg of DS-3 per 10 litres of water. The correct concentration depends on the amount of scale and the application.

Can I mix Fernox DS-3 with boiling water?

No. Hot water speeds up descaling, but Fernox states that the solution temperature must not exceed 80°C.

Why does the solution change colour?

The colour shows the remaining descaling power. It starts yellow, changes through green and finally turns blue when exhausted.

Can I use DS-3 on stainless steel?

Yes. Fernox lists stainless steel as a compatible material. However, always check the complete appliance construction before treatment.

Can I use DS-3 on aluminium?

Do not use it on thin-gauge or badly corroded aluminium. If you are unsure, contact the appliance manufacturer before use.

Can I use DS-3 on chrome-plated taps?

No. Fernox lists chromium-plated surfaces among the material restrictions.

Does the equipment need rinsing after treatment?

Yes. Drain the cleaning solution and rinse the equipment several times until no traces or odours remain.

Can homeowners use Fernox DS-3?

Fernox designed the product to be safe and straightforward when used correctly. However, it is a hazardous acidic cleaner. Therefore, follow the safety instructions and use a qualified engineer for work involving boilers, cylinders or complex hot-water systems.