What I do know is that there is an indulgence when you bless yourself with holy water. Yet I do see people going into Mass and coming out without blessing themselves with the holy water in the entrance font.
This is what +Lefebvre would say: " I can't understand why people bless themselves with Holy Water when leaving a church! You bless yourself BEFORE entering the nave to purify yourself because it is a holy space'..
Also drives satan away.. ' Think "Asperges me..." before Sunday mass.
At least two priests relayed that attitude to me. Makes sense. Also when 1000's are leaving a church , it creates disorder if everyone is dipping their hand in the Holy Water fount...colliding with others who are exiting in earnest, rapidly!! Now that's a practical advice from our Founder.
Make sure you throw out any holy water on the Sacred Triduum - Good Friday. That would restrict your "Infinite" term. Water does corrupt naturally. Easter water is most powerful they say.
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https://adoremus.org/2007/12/holy-water-lent-and-triduum/"...The response reaffirmed the traditional practice that the holy water font is empty only during the Sacred Triduum (Holy Thursday, Good Friday, Holy Saturday) in preparation for the blessing of new water during the Easter Vigil..."