Is this any good removing limescale in a hot water cylinder

Yes I have used this on an indirect hot water storage cylinder in fact there are instructions in side how to do this. The illustration of a hot water cylinder on the outside of the tub is what drew my attention. However what I did was turn off cold water supply to cold water header tank in loft then drained hot water storage cylinder enough to allow removal of emersion heater, the added weight of the water inside the cylinder helps with the removal of the immersion, then drained hot water cylinder enough to allow coverage of internal coil and added lime scale remover this I found allows a stronger solution to be added and allows you to monitor progress once de-scaled flush system thoroughly and re-assemble. Hope this helps.

Can this be used in central heating system

No, you need one specifically for central heating. This is for taps/ kettles etc

Can this be used to clear a blocked cold water pipe?

If the blockage is scale related then potentially yes - it could take some time and it may be easier and cheaper to cut and replace the blocked section. If it used then a full flush to ensure the chemical has completely gone out of the system will be required after the blockage has cleared - especially if potable/drinking water supply as the product is harmful to humans and environment if not used correctly and safely.

Fernox DS-3 How do you add it to hot water system?

Why would you do that? It then means you will have descaler coming out of your hot taps in the house. It won't make for a very nice bath. I use it to descale kettles etc. Use a tablespoon in half a kettle of water, boil and rinse several times before using.

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DS-3 LIMESCALE Remover 2KG

Product ID: 51753756

Details

Brand
Fernox
Contains liquid contents
No
Item form
Granule
Item volume
2 Kilograms
Item weight
2 Kilograms
Manufacturer
FERNOX

⚡2KG powerful granules

🧪Sulphamic acid formula

🛠️Safe for domestic appliances

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€ 68.11

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Description

🧼 Say goodbye to limescale, hello to flawless appliances!

HEAVY DUTY 2 KG POWER - Bulk granules designed for deep, effective limescale removal—no half measures.
NON FOAMING EFFICIENCY - Granules dissolve cleanly, preventing messy foam and ensuring smooth appliance operation.
APPLIANCE SAFE GUARANTEE - Engineered specifically for domestic use, protecting your valuable home devices from corrosion.
SCIENTIFICALLY FORMULATED - Advanced sulphamic acid blend with inhibitors and indicators ensures precision cleaning without damage.
EFFORTLESS MAINTENANCE UPGRADE - Transform your cleaning routine with a product trusted by pros to extend appliance lifespan.

FERNOX DS-3 Limescale Remover is a 2KG granule-based cleaning powerhouse formulated with sulphamic acid, inhibitors, and non-foaming surfactants. Designed specifically for domestic appliances, it effectively dissolves stubborn limescale deposits while protecting your devices from damage, ensuring long-lasting performance and hassle-free maintenance.

Specifications

ASIN	B006UI4HC8
ASIN	B006UI4HC8
Best Sellers Rank	23,193 in Grocery ( See Top 100 in Grocery ) 182 in De-Scalers
Brand Name	Fernox
Contains Liquid Contents?	No
Customer Reviews	4.7 4.7 out of 5 stars (63)
Customer reviews	4.7 4.7 out of 5 stars (63)
Delivery information	We cannot deliver certain products outside mainland UK ( Details ). We will only be able to confirm if this product can be delivered to your chosen address when you enter your delivery address at checkout.
Item Form	Granule
Item Volume	2 Kilograms
Item Weight	2 Kilograms
Item model number	DS-3
Manufacturer	FERNOX
Manufacturer	FERNOX
Model Number	DS-3
Number of Items	1
Package Dimensions	20.5 x 20.2 x 10.4 cm; 2 kg
Part Number	DS-3
Size	2 kg (Pack of 1)
Special Features	Removes limescale
Unit Count	2000.0 gram

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