As long as the StarSan is still clear, it is probably fine. It won't hurt the bucket and the cloudiness on the tube is normal. I mix up StarSan with distilled water in a 5 gallon bucket and use it for months or until it runs out.
Draft 1: Lightly smoked Weizen
Draft 2: Belgian Wit
Draft 3: Rauchbier
Primary 1: German Scwarzbier
On Deck: Belgian Brown Ale, Pale Ale, Stout