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We have a septic tank, anything that's water coming from he house goes in it. Dishwasher, washing machine, shower etc. so can't see snow foam being an issues, my snow foam when I used it went into a local stream, shhhh.
At 19, i'd sell the cup and get the cheapest car I can find to run, unless you've got loads of dosh.
But out of the options you've given i'd keep the cup.