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Do you mean add a backflow valve ? Other information: I added 0.5m length of tube between the filter and the fountain and the pitch gets much lower---seems like I need a damper inside the tube.

I recently changed the water filter in line with the drinking fountain and it now makes a loud whistling/whining sound, at relatively low frequency. The sound will persist as long as the drinking fountain is flowing. Fountain: The drinking fountain was part of a Whirlpool WHER25 RO filter...