When a bath bomb comes in contact with water, the baking soda and citric acid react to make carbon dioxide bubbles. This is an acid–base reaction, where baking soda (also called sodium bicarbonate) is a weak base and citric acid is a weak acid.
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The filter bed is cleaned by occasional backwashing ;-; im sorry if this isn't a great answer but I tried
The nonpolar end of a soap molecule attaches itself to grease.
