The only thing with filters, they may cure the problem but the cause is still there, I have lost track of the amount of post That have had apparent spurious L.S triggering where I have advised on earth bonding all supply commons and possible equipotential earth bonding of the machine and it has cured the problem.
Unfortunately many of these legacy posts are no longer there to quote as they disappear after a certain age due to forum 'cleaning'
Al.