How often to demagnetize mc cartridges?


Just bought a used sumiko fluxbuster and demagnetized my Lyra Etna for the first time.  Pretty nice improvements in sound!  How often should cartridges be demagnetized?
wcheng2
I try to demag every 50 hours of play. The Cardas album deflux treatment is also one of my protocols. Enjoy the music
Depends on how the coils are constructed. If iron core, the core can be magnetized. Then an occasional hit with flux buster is worth doing. But not very often.