Belz...
Fiend God
I don't think they do, but they seldom use a fresh MT. What most pharmacies seem to do is that they keep a big jar of a low potency, then take a drop from that and work on. When the jar is about empty, they dilute it, succuss it, and presto! They have a new jar of a slightly higher potency (nice way of doing business).
But how in the blue hell do they avoid having water that's contaminated by millions of years of "memorising" other substances ?
It boggles the mind.