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IMO Regulations 1.1.3

1.1.3 It should be understood that a gravitational filtering equipment cannot be expected to be effective over the complete range of oils which might be carried on board ship, nor can it deal satisfactorily with oil of very high relative density or with a mixture
presented to it as an emulsion. Cleansing agents used for cleaning purposes in machinery spaces may cause these emulsions in bilge water.
To avoid this, only those cleansing agents which do not affect the performance of the equipment should be used, and care should be taken that the bilge water is fed to the filtering equipment after the emulsion has broken.
Considering that not all designs of equipment are affected in the same way by cleansing agents, the manufacturers of filtering and monitoring equipment should supply recommendations concerning the use of cleansing agents, and these recommendations should be followed in shipboard practice.

MEPC 33/20/Add.1 Annex 10 Page 4
(emphasis added)