It foams if you put too much in or put it in too quickly...
It smells bad - yep, but so what? Do you sit with your nose over your pipes all day? At the end of the day it's closed loop so smell is irrelevant, and the only time you do get the smell is when you empty it and sling it down the sink...
As it foamed, he'd put too much in, so silicates etc in higher conecntration = more to precipitate out = white gunk etc appearing, and would therefore appear "useless" if white gunk was misinterpreted as signs of algae etc.
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