00:00You might be wondering why this worker is putting a sponge ball into a concrete pipe.
00:04The reason is that when concrete work is completed at a construction site,
00:07some concrete remains inside the pipe,
00:10which slowly builds up into a thick layer over time and eventually blocks the pipe.
00:14After that, removing the hardened concrete requires extra effort and a lot of time,
00:18so a simple solution is used.
00:20A sponge ball is flexible, which means it can expand or shrink according to the size of the pipe.
00:25That is why, after the work is done, water is poured into the concrete pipe,
00:30the sponge ball is inserted, and then compressed air is released from behind.
00:34As the sponge ball moves through the pipe,
00:35it pushes all the leftover concrete and dirt out of the pipe.
00:39Sometimes the simplest solution works best.
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