DWB (20 kg) View larger

DWB (20 kg)


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£ 51.42 tax incl.

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DWB is a formulated blend of powdered salts to increase mineral content of brewing liquor to produce the desired beer characteristics.


  • Reduces the pH during mashing and wort boiling which improves enzyme activity
  • Promotes the precipitation of unwanted proteins in the kettle, hop back or whirlpool
  • Improves health and vigour of the yeast
  • Improves extract yield and fermentability
  • Reduces risk of infection
  • Reduces extraction of undesirable silicates, tannins and polyphenols
  • Reduces beerstone and can prevent gushing in beer
  • Reduces colour formation in the copper
  • Improves beer fining performance
  • Promotes head retention on beer
  • Adds chloride which impart palate fullness
  • Adds sulphate which give beer a drier and more bitter effect


The objective of liquor treatment is to convert your water supply into acceptable brewing liquor. Treating your brewing liquor is vitally important. When applied correctly all the steps throughout the brewing process will be at the optimum pH. If it is applied incorrectly you will get poor extract and beer that is difficult to clarify.

AMS adjusts liquor alkalinity without the need for boiling by removing unwanted carbonate ions and adding desirable ions, such as chloride and sulphate in the correct ratios, ideal for most beer styles.

Alkalinity is mainly caused by calcium carbonate and bicarbonate. The alkalinity of your liquor plays a very important role in pH control. It causes high pH values throughout the brewing process. Hydrogen ions are removed from solution, thus wort pH remains high which results in low extract yield; presence of undesirable protein components; worts and beers prone to infection; increased extraction of silicates, polyphenols and tannins during sparge and harsh “after tastes” in the finished beer.

The pH of the liquor will have little effect on the pH of the wort and beer. Alkalinity and calcium are more important in pH control. Once you have established correct levels of these ions it is advisable to follow the guidelines of typical pH measurements in the brewing process shown below. Hand-held pH meters can be purchased from Murphy & Son Ltd.

Rates of DWB should be determined based on the final brew-length and are dependant on the levels of calcium, sulphate and chloride present in your untreated liquor.
Levels of the relevant ions present in your liquor can be obtained from your Local Water Authority or you can send in 50ml of your raw liquor to Murphy’s laboratory for a full analysis and suggested treatment rates. This service is free of charge once a year. Please note Local Authority reports can provide results that are not up to date and this may affect your calculations for ideal dosage rates. It is advisable to check the analysis of your water at least once a year, or on a more regular basis if the supply changes.
Once you have obtained your analysis of your raw liquor you can then calculate your dosage rates by selecting which beer type you wish to brew and refer to table 1, this will help you determine how many ions to add.

Knowing this information you can calculate the amount of DWB needed to increase the relevant ions to the ideal level.
Murphy’s are more than willing to calculate these dosage rates for you just simply contact our laboratory: +44 (0)115 978 2728

For more info read our article, water, water everywhere http://www.murphyandson.co.uk/water-water-everywhere/

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