A while ago, I scooped some rainwater and sediment from the water butts* in my garden and sealed it in a jar, which I placed on the windowsill of my studio.
This video details some of the things I saw inside the jar in the second and third weeks after starting.
*Yes, it's really called a 'water butt' - https://www.diy.com/departments/ward-100l-slimline-water-butt/679230_BQ.prd
Here's the link to a video by Journey Into The Microcosmos, showing a much better view of Paramecium that (I think) are very similar in appearance and behaviour to the organisms seen in this video:
/watch/604=t?Qedg-lb5iLK5=
Music:
Oxygen Garden by Chris Zabriskie is licensed under a Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/)
Source: http://chriszabriskie.com/divider/
Artist: http://chriszabriskie.com/