How large is large scale? Not trying to dissuade you, but if you don't understand the mechanics of a bucket DWC, you may want to re-evaluate if your ready to jump into a large scale operation.
But to answer your question... the buckets are all linked together via 1/2 or 3/4 hose to a control bucket. Gravity does the rest so when you fill or drain the control bucket, all the rest do the same. HOWEVER, when you start linking a metric fuck load of buckets together, you are going to start running into problems related to fluid dynamics... namely unequal fill and drain rates.