Well, when removing taint, you'd have to try and lower the taint levels down to numbers lower then 1500. If you do, then the taint slowly vanishes. Basically, I'd just use the vis condensers, concetrated evil, and tainted crystals, but if possible, I'd slap on a Quicksilver core, or a singularity core. The taint would go to thaumium reinforced tanks for extra storage, while it's being pumped through purifier loops. And if I find that I don't have silverwood trees? I'd settle for filter stacks.
The only problems I'd face when cleaning up taint, (aside from tainted creatures) is dealing with gas pods that spew out taint. Especially if the chunk below has a lot of caves and open areas. One area I found, had a mineshaft, and taint was everywhere down there. The battle against taint can be below as well. Even worse though, is the fact at on top of that chunk, is a jungle. So I'm usually split between checking an eye above ground, and checking up underground.
On a side note, what CREATES tainted aura? For some reason, some chunk in my home keeps generating taint in the aura. Quite a lot actually. I have... maybe 19 Totems of Dawn in that area, and the taint still manages to exist in the aura. It's really starting to worry me. It's added about 250 taint to the chunk. Thankfully, it has a long ways to go, since I had drained the taint from the area once. I think it might be because of a tainted batch of crystals, so I might just use a quarry to wipe out the chunk to remove those crystals.
Correct me if I am wrong about tainted crystals. I really don't want to create a giant pit of shadows underneath my home.