What is making this sound? What is making this sound? BobDoe123 (Mechanical) (OP) 18 Apr 17 00:25 Hello, I'm curious to know what is creating the sound from this Youtube video assuming all of this is done only with water flowing through the fountain. https://www.youtube.com/watch?v=6O9fRrGy3lM&fe... Thank you very much for your time. RE: What is making this sound? GregLocock (Automotive) 18 Apr 17 02:31 It sounds like the electric booster pump on my off grid service, but could easily be a piece of ptfe tape fluttering in the pipework. Cheers Greg Locock New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?