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They're not kept full all year long, there is a blessing concerning Holy Water that takes place solely during the Triduum. But that is not the water kept in the font.
There is a fairly erroneous Catholic tradition that some priests take part in where they dump all the Holy Water before Lent starts then fill them back up when Easter comes around.
What we do get fresh before Easter are the three Holy Oils and the Easter candle for the year. But a priest could bless water, salt or whatever whenever he wants to. It could be said that Easter Blessed water is better, but it's probably just as good.