# The Milk (Special Designation) Regulations 1988, Paragraph 10


The water used for generating the steam which is to be applied to the milk shall be wholesome and shall be treated with no water treatment compound except–
(a) any such compound necessary to make it wholesome;
(b) any of the following boiler feed water treatment compounds:–
Potassium alginate
Sodium alginate
Potassium carbonate
Sodium carbonate
Sodium hydroxide
Sodium dihydrogen orthophosphate
di Sodium hydrogen orthophosphate
tri Sodium orthophosphate
penta Sodium triphosphate
Sodium polyphosphates
tetra Sodium diphosphate
Sodium silicate
Sodium metasilicate
Sodium sulphate
Magnesium sulphate
Neutral or alkaline sodium sulphite
Unmodified starch
Sodium aluminate
Polyoxyethylene glycol (minimum molecular weight 1000).

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Source: https://www.legislation.gov.uk/uksi/1988/2204/schedule/4/paragraph/10 (the official version)
Page: https://openlegislation.uk/milk-special-designation-regulations-1988/schedule-4/paragraph-10
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.