Can also rotate the air in your car tires, but it doesn't make a difference
If you have that boat in the water, then the ballast NEEDS to be filled. It's the only real weight to counter the mast and pressure from the sails.
I looked at a couple of those boats in my search for a "learning boat". I wound up with an older Macgregor Venture 25 instead - because it has a weighted keel and I don't really like the idea of a water ballast system on a boat, especially not a sail boat (after I did some research).
Couple of questions - where is your boat, and where do you plan to keep it for "years" since it's really a trailerable boat.