Reviewers recommend using distilled water for this little gadget, which can help you de-stress at home.
Promising review: “This is exactly what I wanted. As recommended, I cleaned all items before assembling, washed the rocks, and used distilled water. I would highly recommend this product for anyone looking for the relaxing sound of water falling. I have it in my bedroom, and I sleep like a baby!” —Amazon Customer
Get it from Amazon for $24.99.