Ballast tanks are used in flight testing by aircraft manufacturers (like Boeing and Airbus) to safely control and manipulate an aircraft’s centre of gravity and weight distribution during test flights.
Filled with water, these tanks allow engineers to simulate various passenger or cargo loads.
They can test the plane’s stability and performance under extreme forward or aft centre of gravity changes in load distribution.
The idea of these tanks seeming reasonable only comes if you are first told aerodynamic trails are wing-sprayers.
This is just another part of the misinformation network. A whole false scenario has been put together like a mystery, and clues have been left to light the path.
The path is followed by following the clues. The clues are carefully put together to make each step more compelling. The bread crumb trail is carefully set to lead to a false conclusion.
It is only after much investigation that the clues can be seen to have come from false ideas.