I agree with the digital hygrometer....they are pretty inexpensive and more reliable.
Beads require less maintenance overall, and only distilled water.......but you can maintain good rh with oasis foam and solution if your humi has a good seal, and you are willing to devote the time to it and watch it closely. A proper solution should provide protection from bacterial growth and mold, so I'm at a bit of a loss there......unless like Deedbubya said its calcium build up....which shouldn't happen with solution.
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