Fernox Cleanser and Descaler with Neutraliser 2kg

Product Code: FERDS40
Available 2 - 4 Working Days
Manufacturer Fernox
Product Code FERDS40
MPN 608241
EAN 5014551611023
£33.72 inc VAT £28.10 exc VAT

The Fernox 608241 is just part of the Central Heating Treatment product range available to buy from Trading Depot. Click here to find out more
Manufacturer Fernox
Product Code FERDS40
MPN 608241
EAN 5014551611023
  • Product info

    608241 Fernox Detail

    Description Fernox Cleanser and Descaler with Neutraliser 2kg Powerful descaler and sludge remover for cleansing domestic central heating systems, Eliminating boiler noise. Its Compatible with all metals and materials and is commonly used in central heating systems. DS-40 is only recommended for whole system cleansing where the system is known to be sound. If there has been a history of leaks or weaknesses are suspected usually on older installations Fernox Heavy Duty Restorer (Superfloc) should be used. Separate boiler de-scaling with DS-40 can be carried out safely on systems of any age following whole system cleansing with Heavy Duty Restorer (Superfloc). Fernox DS-40 will dissolve oxide sludge and limescale to leave metal surfaces completely clean. Use of neutraliser sachet provided in the pack ensures that the system is fully conditioned prior to the addition of a suitable Fernox Central Heating Protector. Fernox DS-40 is well inhibited and compatible with all metals and other materials commonly used in central heating systems including aluminium. Fernox DS-40 is also suitable for use with all know acid resistant makes of powerflushing unit. The procedures outlined on this sheet can all be carried out with the boiler and radiators in situ. The boiler is needed during cleansing operations. Physical Properties Fernox DS-40 is a blend of food grade organic acids with inhibitors and surfactants. Colour: Off white/cream Odour: Slight fish Form: Crystals. Powder pH: 2 at 2% w/w in water SG: n/a Application and Dosage Preparing the system For optimum results the entire system including drop feed radiators where fitted should be completely drainable. Preferably full bore gate valves with hose connectors should be provided temporarily for this purpose. Motorised and thermostatically controlled valves must be set so that no part of the system is closed off during cleansing or rinsing. Check that the overflow pipe from the feed and expansion tank (open vented systems) does not discharge into the cold water storage tank or onto any surface which could be stained by the cleansing agent. Where appropriate a hose should be fitted temporarily to the overflow pipe and lead to a suitable drain. To carry out separate boiler de-scaling create a restricted circuit by isolating flow and return pipes to the heating circuit or by closing the lockshield and wheelhead valves to all radiators. The cold feed and open vent pipes must be retained in circuit at all times. Sealed systems must be fitted with automatic air vents (AAV’s) at all high points and should be equipped with isolating valves to prevent spillage if seizure of the venting device occurs. Instructions for use One 2 kg container of Fernox DS-40 is sufficient to de-scale a whole system of 5-10 radiators i.e. 50-100 litres water capacity (2-4%). Repeat doses of DS-40 may be applied where necessary to completely restore system efficiency or eliminate boiler noise. When de-scaling the entire system frequent venting of all radiators is necessary to ensure satisfactory circulation is maintained. Initially drain and flush the entire system with plain water. Dissolve Fernox DS-40 crystals in a bucket of hot water and introduce to the system via the central heating feed and expansion tank or via a radiator using a Fernox Injector. During system de-scaling DS-40 should be circulated for about 7 days under normal operating conditions (maximum of 4 hours is aluminium components are fitted). When separately de-scaling boilers DS-40 should be circulated hot (restricted circuit see "Preparing the system") for 24 hours. Now completely drain and flush the system with cold water. Flushing is defined as the process of filling and then emptying the entire system. Refill the system adding the entire contents of the neutraliser sachet(s) provided. Circulate hot for about 2 hours. Finally drain and flush the system until water runs clear. At least three complete changes of water are likely to be required.
  • Tech Specs
    Product Code: FERDS40
    Manufacturer: Fernox
    Brand: Fernox
    Condition: New
    MPN: 608241
    EAN: 5014551611023
    Treatment Type: Cleaner
  • Delivery info


    Most Mainland UK Postcodes

    ServicePrice (Inc VAT)
    No Rush Postal Delivery - Usually 4-5 Working Days (Note: Only available on items under £50) £4.00
    Economy Courier Delivery - Usually 5-9 working days (Note: Only available on items under £150) £6.50
    Standard Courier Delivery - Usually 2-4 working days £7.95
    Next Working Day Delivery - 1 working day (Only available for IN STOCK items) £10.00
    Next Working Day By 10.30am £21.00
    Next Working Day By 12.00pm £16.00
    Same Day Courier Delivery (Only available for IN STOCK items and central London postcodes) £50.00
    Saturday Any Time £16.00
    Saturday By 10.30am £26.00
    Saturday By 12.00pm £21.00
    Sunday Delivery From £21.00
    Collection from Maidenhead - Usually 1-3 working days
    We will contact you when your order is ready
    Free of charge

    For collections please do not travel until you have had confirmation your order is ready.

    If you need items urgently, please call ahead to check lead times. Our Sales Team are available on 01628 760 440 Monday to Friday 8.00am to 5.00pm.

    We do not recommend Tradesmen are booked until items are safely received and checked.



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    Delivery charges are calculated at the checkout. Standard delivery to England, Wales and parts of Scotland starts from only £6.95 although exceptions do apply and are listed below.

    Please note:

    The cut off for Next Working Day delivery is 3.30pm and Next Working Day refers to Monday to Friday and excludes weekends and Bank Holidays. The delivery options below relate to this product only and may not be available if other items are added to your basket. Only one delivery charge is made per order and the highest will normally take precedence.

    Returning an item

    We offer a no quibble 60 day returns policy on all goods supplied, subject to a few minor exceptions. Find out more on our Returns Policy page.


    Highlands & Islands of Scotland (and postcode exceptions)

    ServicePrice (Inc VAT)
    Standard Courier Delivery - Usually 2-4 working days £16.00
    Next Working Day Delivery - 1 working day Not Available
    Saturday Delilvery Not Available
    Sunday Delivery Not Available

    Includes the following postcodes:
    AB36-AB38, AB55-AB56, FK17-FK21, HS, IV1-56, IV70, IV63, KA27, KA28, KW1-KW17, PA20-PA45, PA47-PA49, PA60-PA78, PH19-PH26, PH30-PH44, PH49-PH50, TR21-TR25, ZE


    Northern Ireland Services (BT Postcodes)Price (Inc VAT)
    No Rush Postal Delivery - Usually 4-5 working days £10.00
    Standard Courier Delivery - Usually 2-4 working days £15.00
    Next Working Day Delivery (Dublin Only) - 1 working day £27.00
    Ireland (Eire) ServicesPrice (No VAT)
    No Rush Postal Delivery - Usually 4-5 working days £10.00
    Standard Courier Delivery - Usually 2-4 working days £15.00

    Channel Islands & Isle of Man

    JE, GY, IM Postcode ServicesPrice (No VAT)
    Standard Courier Delivery - Usually 2-3 working days £22.60
    Next Working Day Delivery - 1 working day £56.00
    Next Working Day By 12.00pm £76.00
    Saturday Any Time £78.50
    Sunday Delivery Not Available


    All delivery times and dates especially next working day and weekend delivery times are always provided as a guide and are not 'guaranteed'. We use reliable couriers with a 99.9% success rate however once a consignment is within the courier network there is always a very small chance something could go wrong, however unforeseen. Trading Depot will not be liable for any costs incurred by any such delays waiting for goods. Trading Depot advises strongly against booking Tradesmen until after goods are safely received and checked for this exact reason.