If you get a bag of a dozen or so and change them once a month, I suppose that would work, but they start to clog up quickly. Air flow coming out when draining is severely limited. When that air comes out at a good flow, it takes a lot of moisture with it. When it is a trickle as these turn into after a few weeks, it's keeping your tank a lot more damp than it could be. Change these regularly!
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