Should I keep a jar of water in my piano?
An open jar of water kept in the bottom of an upright piano is the old fashioned method of adding moisture to the piano during the dry winter months. It won't hurt, but it's not very effective and there is no control over it as in a real climate control system. If you haven't been convinced to install such a system, investing in a room humidifier would be a more effective compromise than relying on a jar of water.
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