Acid Descaling Powder 25KG

£360.00 exc. VAT

  • Incorporates protective film inhibitor
  • Protects mild & stainless steel, copper & brass
  • Effective penetrant & dispersant
  • Dissolves limescale

Safety Data Sheet emailed upon order.

For business and contractors use only.
Product unsuitable for public & domestic usage.

Product description and usage details below.


Buy 5-10 pails, receive a 10% discount
Buy more than 11 pails, receive a 15% discount

Descaling Powder

Comes in 25kg Keg (Powder Chemical)

Sulphamic Acid Based Cleaning Agent

  • Incorporates protective film inhibitor
  • Protects mild & stainless steel, copper & brass
  • Effective penetrant & dispersant
  • Dissolves limescale

Product Description

DESCALING POWDER is a highly active cleaning agent based on Sulphamic Acid supplied with a special film forming inhibitor to protect mild steel, stainless steel, copper and brass against acid attack. The inhibitor also serves as a penetrant and dispersant to enhance the effectiveness of the acid.

DESCALING POWDER can be used to dissolve limescale (calcium carbonate) deposits in boilers, calorifiers and heat exchangers.

DESCALING POWDER should NOT be used on aluminium or galvanised surfaces.

How to Use

Depends on degree of scaling. Normally a 10% solution (100g per litre) will remove carbonate deposits. Up to 30% solutions may be used at temperatures below 70oC for removal of stubborn deposits. The inhibitor solution should be added at rate of 250ml per 25Kg of powder.

Completion of descaling should be determined by either testing acidity or pH periodically. When descaling is complete acidity or pH should be constant. If solution shows no acidity or pH rises to 4 or higher then more Descaling Powder solution should be added.

After completion of descaling equipment should be drained and flushed thoroughly and any acid effluent neutralised with Alkbuild or Neutralising Powder.

acid cleaning Heat Exchangers or calorifiers

Initially add 5kg of  DESCALING POWDER for every 100 litres of water in the circuit. This will usually cause foaming as the acid reacts with the calcium carbonate.

Once the foam has died down it is an indication that either the cleaning solution has lost its strength or the scale has nearly all reacted. To test this take a sample of cleaning solution and carry out an acid concentration test. If the acid concentration test indicates a low concentration then a further 2.5kg of  DESCALING POWDER  for every 100 litres of water in the circuit.

Once no more foam is generated by the addition of acid the system should be left to circulate for 1 hour prior to flushing and neutralisation.

The effluent should be neutralised to between pH 6 and 9 by the addition of either Alkbuild or Neutralising Powder prior to disposing to sewer.

(Extracts taken from heat exchanger acid clean procedure)

acid cleaning steam boilers

Contact Feedwater for specific guidance or for a quotation to carryout this type of cleaning for you.

Related Products

Descaler SF – highly active cleaning agent based on Hydrochloric Acid

Neutralising Powder – powdered alkali used for pH correction after acid cleaning.

Alkbuild – Liquid Neutraliser

Servicing options and contracts available

Take advantage of Feedwater’ servicing options and contracts when you buy our chemical products.

How to descale a heat exchanger

Check out our procedure and chemicals list

Additional information

Weight 25 kg

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