Hydrosol or hydrolate is formed by the water soluble part of Essential oil, mostly polar compounds. These polar compounds are most of the time bioactive compounds. So hydrolate extract are most of the time more active against bacteria.

Find here publication on this topic.

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DOI: 10.1002/ffj.1863

Polar hydrolated compounds are active against pathogenic bacteria such as many phenols,quinone ,eugenol....etc

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I recommended to visit the link below

Article Antibacterial activity of essential oils, hydrosols and plan...

Thank you for your replies, and also thank Mohamed Morsy for the link!

Kalpna

This is a very common misconception. Actually the essential oil components dissolved in the hydrolates may have antimicrobial effects in pure for, but are not present in sufficient concentrations in the hydrolates to prevent bacterial growth, see:

Labadie C., et al : Hydrosols of orange blossom (Citrus aurantium), and rose flower (Rosa damascena and Rosa centifolia) support the growth of a diverse spoilage microflora Food Research International 76 (2015) 576-586