Acid washing a swimming pool - GIF

Acid washing a swimming pool.

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Previously:

Above-ground pool draining fail - GIF
Cleaning a dirty swimming pool - GIF
Driving a snowmobile across a pool - GIF
Filling a yacht pool with seawater - GIF
Sky Pool transparent swimming pool - GIF

Probably muriatic (hydrochloric acid).

I did some of this in a summer job during school. The parks dept managed the municipal pool. Like these guys, no PPE at all.

I can recall getting a big lungful of the fumes and vomiting several times. Just a really dangerous scene.