[quote="phoage, post:7, topic:265339"]
As I understand it, (and I may be faulty in my understanding), sacramentals do not give grace but can lead you to grace. So if my rosary leads me to pray regularly, that brings me closer to God and will give me grace. The blessing on my rosary has nothing to do with that, just reminds me that this is not a fancy necklace but something to be used to commune with the Lord.
In the case of Holy water, it would be to remind me of my baptism and the vows associated with it.
In neither case would the grace have anything to do with how it was blessed or even if it was blessed as long as I am reminded of the appropriate associations.
In any case, that is my $0.02
They are sacramentals and, as such, they produce the following specific effects:
Excitation of pious emotions and affections of the heart and, by means of these, remission of venial sin and of the temporal punishment due to it.
Freedom from power of evil spirits;
Preservation and restoration of bodily health.
Various other benefits, temporal or spiritual.
All these effects are not necessarily inherent in any one blessing; some are caused by one formula, and others by another, according to the intentions of the Church.