To avoid the hydrophone from picking up hums, the water you are recording in should be grounded. Often, the easiest way is to connect the audio ground of your mixer / recorder with the water. ATTENTION: Never do so when recording from a boat and your mixer / recorder is connected to the electric ground of the vessel. If you are experiencing inducted mains hum ALWAYS disconnect the ground of your mixer / recorder from the power supply ground (e.g. use battery power instead) before you connect the audio ground with the water.
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