No, that's how a small dessicant fabric bag works that you might stick in a sealed box, but these aren't like that.
They fill up the lower transparent half of the bag with clear water (dessicant invisibly dissolved in it) that you just pour down the drain and throw away the now empty bag.
Each bag can hold .5 or 1L of water; in a stateroom (bedroom), you might have to replace the bag once a month, depending on the humidity on board.
No risk of overflowing, since once the dessicant is used up, it stops working and the bag just sits there, visibly full of water.
They fill up the lower transparent half of the bag with clear water (dessicant invisibly dissolved in it) that you just pour down the drain and throw away the now empty bag.
Each bag can hold .5 or 1L of water; in a stateroom (bedroom), you might have to replace the bag once a month, depending on the humidity on board.
No risk of overflowing, since once the dessicant is used up, it stops working and the bag just sits there, visibly full of water.