For the earlier salt water cure if it is not covered, leave it in an open area. Avoid placing it in an enclosed area.
Salt water with copper (An Ren Shui) is consider ancient technology, ionizer bulb is a great idea.
I will consider using plants to purify the air, taking the time to care for living things will also nurture good character for example like patience...
Character development and enhancement are also part of FS isn't it?
FS is nature