I find that I will usually dump the white ash if it builds up quite a bit. If I'm down to the last third of the bowl, usually there is quite a bit built up, so I'll use my tamper-poker to gently loosen the white ash, and dump it.
Amen Brothers! Ain't no science to it, ash is an insulator, that's why the dumb sh1ts can walk on "hot coals" at the pricy seminars. Carefully dump that ash and relight.I dump when and if I have to relight. Relights are poor with accumulated ash.
- nsfisher
Quoted for truth. []