Just a personal story that may be edifying and may fit well with the topic of Blessed Salt.
Many years ago, we moved into a house in Ohio. It turns out the house had many disturbances, everything from apparitions, voices, noises, evil feelings, objects moving, shadow "people", orbs, etc. It was VERY active. In fact, I don't think a day went by without something happening. At the time we were "conservative Novus Ordo", and naturally got some holy water from our local parish. The Holy Water was blessed with the new blessing, and consequently didn't have any exorcisms attached. It would help a little, but actually seemed to irritate the demons. It was my job to go around the house each evening and sprinkle the Holy Water in every room. One day I forgot and went to bed. Just as I was laying down to sleep, my bed started shaking violently. At first I thought it was my brother, but he wasn't even in the room.
I never forgot again.
We had the priest come down and bless the house. He was ordained in 1947, but used the new formula for the blessing. It was entirely ineffective.
We went to a conference where a semi-trad priest (who would say the NO in Latin and the Traditional Mass alternatively) gave a talk on Blessed Salt. He had a number of containers of salt on a table at the front of the conference room. Following his talk, he blessed/exorcised the salt according to the traditional formula, with the intention of distributing it to the families there. We eagerly grabbed a container and, the moment we got back to the house, sprinkled a healthy helping of blessed salt in the four corners of each room.
Immediate relief. Everything stopped. It was blissfully peaceful for many months afterwards.
The family went on a road trip the next year, and my aunt remained at home by herself. While we were gone, bless her heart, she decided to do a deep clean of the house. Out came the shop vac, and she proceeded to "clean" all the baseboards, corners, etc., of every room.
The same night, she called us in a state of panic. The house had "come alive" again, and was even worse than before. My father instructed her to get the blessed salt from the closet and replace the salt she had vacuumed up. Again, relief.
It is potent stuff.