English: Sewage treatment trickling filter bed using plastic media – small rural treatment plant at Beddgelert sewage treatment works, Gwynedd, Wales, UK.
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自己的作品 (taken by user Velela with a Pentax Optio555 digital camera. 1/50sec @ f2.8)
La bildo estas kopiita de wikipedia:en. La originala priskribo estas: '''Sewage Treatment trickling filter bed''' - small rural treatment plant '''Author''': User:Velela. <br> '''Location''': Beddgelert sewage treatment works <br> '''Source''': P
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