I think better to change the tile to "Salting Procedures for Discus in new homes"...muahahaha...

Okie, as for me....quarantine discus is a must. But for how long? At least a month (roadspike, 1 week is too risky!! )...to be on the safe side to prevent any major outbreak or wipe out all your discus. Though it doesn't guarantee this, at least we all know that the risk has been minimized. One major problem is that certain outbreaks or disease will only manifest itself after a month or more. So, that's why I stress at least a month. I would normally start mixing newly bought fishes with my own batches after 3-4 months.

First 3-5 days I used salt (1 tablespoon for every 10 gallon), no feedings for at least 3 days (after that, small feedings and gradually increase the feedings overtime) and will treat quarantined fishes IF AND ONLY IF there're signs of clamped fins, cloudy eyes, bloated stomach or when it gets dark. I find that Potassium Permanganate, Formalin and lowering of ph helps tremendously.
Lowering of ph to help recover sick discus is outlined in the book Exotic Discus.

At the sametime, quarantine tanks should be disinfected if not used. I find bleaching & PP very effective.