The collar should be washed with warm water ONLY. Absolutely no soaps or chemicals as these will compromise the integrity of the Effective Microorganisms!
Rotate and rinse the clay beads often - the beads will work best when they are clean and free of debris.
Swimming with the collar is fine - as long as it is not in chemically treated water. (i.e. chlorine or bromine)
Hang to dry in a warm, sunny area.
The paracord I use is the highest quality: