What exactly do I need to look out for to know when it's time for the refill?

The description says that it lasts up to 3 months.
Depending on the humidity, that will probably be sooner or later.

But how do I know exactly when it's time for the refill?
When the "stone" has more or less disappeared?
Or simply when the 3 months are up?

Thanks for any advice in advance!

Question

What exactly do I need to look out for to know when it's time for the refill?

The description says that it lasts up to 3 months.
Depending on the humidity, that will probably be sooner or later.

But how do I know exactly when it's time for the refill?
When the "stone" has more or less disappeared?
Or simply when the 3 months are up?

Thanks for any advice in advance!

Accepted Answer

The stone gets smaller every day. As its surface area shrinks, its ability to draw water from the air decreases. Shortly before the stone is invisible, you need a new one at the latest. In our case it didn't last 3 months. It was used in the laundry room in the basement.

Answer

You can tell when the block is used up or only small. The block is gradually dissolving.

Your data. Your choice.

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