Add chicken breasts to instant pot inner pot
Cover with four cups filtered water
Add four tablespoons salt
Put lid on Instant Pot and make sure sealing ring is in place and vent is set to sealed for pressure cooking
Set regular pressure cook setting and set to zero minutes
One Instant Pot comes to pressure, let natural release for 10 - 15 minutes, then quick release to release the rest of the pressure
Remove chicken from Instant Pot and let rest at least 10 minutes before slicing
For most uniform slices, chill in refrigerator at least an hour before slicing