He said there was some evidence deep cleans worked, but added: "It's a public confidence builder".

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Mr Large represents many of these firms, which are also being asked to carry out deep cleans.

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But opponents of the deep cleans have been joined by representatives of the companies who, alongside in-house cleaning teams, are responsible for carrying them out, and of the managers responsible for overseeing them.

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Mirra deep cleans any type of in-ground pool surface and water without using the pool's filtration system, hoses or booster pumps, which results in energy cost savings from running these pool systems less frequently.

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