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In many parishes, the priest will bless the waters on Theophany using the lesser blessing (blessing a large glass "punch" bowl or a tank filled with water) instead of the greater blessing (blessing a river, lake, canal, or ocean). And people drink that water. Thus, I never really knew the difference between the lesser and greater blessings that occur during the pre-feast and the actual feast of Theophany.
I guess this would be considered an example of "economia."
There are at least four different and distinct blessing of waters.
1. Theophany Eve
2 Theophany Day
3. Outdoor Blessing of Water
4. Blessing of Water on the start of the month (sometimes called lesser blessing)
1 and 2 are almost identical, the only difference is that 2 has an allowance for the prayer to be shortened.
3 follows the same structure as 1 and 2 but is abbreviated, and there is an addition of a prayer that is said over the person who retrieves the cross.
4 is a unique service unto it self that is hardly ever done in a parish setting
And of course 5 occurs during the baptism ceremony and is unique to that service.