Activated charcoal is porous. It will trap toxins, bacteria, and odors, and will clear the water. You can go longer without changing out all the water, just keep adding more.

I see this $8.75 jar of activated carbon is 40% off on Amazon.
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This technique is awesome for keeping fiddle leaf fig cuttings going a long enough time to not only grow roots but hang out for a while until you're ready to transplant.

The link above is an affiliate link. This is a great price with the discount. But maybe you can find some cheaper elsewhere. Happy Propagating!

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