I don't know anything about this, but by reading what the guys have said I would advise that you put together a plan.
If they ask how do you get rid of the old salt water, you tell them:
A - I don't do water changes as of right now, just top off fresh, but I am planning on getting a large container where I can evaporate it when I do start making water changes.
B - You go to Home Depot or one of those garden supply places and grab a large brute container and have it ready for when they show up. This way, if they don't buy the no water changes story, you can always tell them that you use that thing in your backyard that you just got.
Regardless of which answer you use, I would take the opportunity to ask them for their recommendation or rule. If you get anything out of this experience, it should at least be knowledge to share with the team.
Good luck!