
I had a humidifier and used it for a long time without this product. However, after putting it in the tank, I saw this sandy white dust on the furniture around the humidifier. It's gritty and almost sticky, and very difficult to remove from furniture (you need a polish or cleaner, not just a rag). Can't imagine it coming from anything else as the addition of fish is the only thing that has changed in the past few months.

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