In Leviticus 11:7 and Matthew 7:6, this signifies filthy loves of those in the hells of adulterers. (Apocalypse Explained 1044[4]) Swine signify people who love only worldly riches. (Apocalypse Revealed 727)

In Isaiah 65:4, this signifies appropriation of infernal evils. (Apocalypse Explained 659[2]) 'Swine' or 'hogs' correspond to the life of greed and its delight.

(References: Arcana Coelestia 1742)

497. And they have power over waters to turn them to blood. This symbolically means that people who turn away from these two essential elements falsify the Word's truths.

Waters symbolize truths (no. 50), and blood a falsification of the Word's truth (no. 379). Thus turning waters to blood symbolizes a falsifying of the Word's truths.

This has the same meaning as before, namely, that people who turn away from the two essential elements of the New Church cannot see anything but the falsities in which they are caught up, and if they use the Word to defend them, they falsify its truths.