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Q5. With reference to Marine Growth Prevention Systems, which incorporate impressed current anodes fitted in the sea boxes or sea strainers of main seawater cooling water systems:

(a) Explain how the system protects steel pipework against marine growth and corrosion: (6)

(b) Explain how the effectiveness of the system can be ascertained: (2)

(c) State the advantages this system has over one which makes use of biocides. (2)