Its also worth noting that due to some code magic, Thaumcraft nodes remain active even when in unloaded chunks - so if you have one node with a buttload of flux, it'll try to balance it out and draw vis from nearby nodes, which in turn try to balance out their flux and draw vis from nearby nodes. So even if no-one has done anything thaumcrafty near spawn, if that node is getting tapped to refill another node, its gonna create some flux.
Best bet is to find the core node with all the flux, build a pure node nearby till its bigger and merge the two. it should purify itself overnight. Though if there are multiple nodes with high\dangerous flux levels, you might need to manually purify several nodes till the vis transfer\flux generation balances itself out.
Best bet is to find the core node with all the flux, build a pure node nearby till its bigger and merge the two. it should purify itself overnight. Though if there are multiple nodes with high\dangerous flux levels, you might need to manually purify several nodes till the vis transfer\flux generation balances itself out.