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In the last arc of KonoSuba season 2, Aqua winds up purifying the hot spring water, turning it into "regular hot water".

What is the difference between hot spring water and "regular hot water"?

The only clue I can see is that it's (hot spring water) animated green instead of clear or bluish clear (regular water).

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    Generally hot springs are considered to have water with purifying qualities since its from mountains and forests. And regular hot water is just... Normal hot water.
    – 僕の彼女
    Commented May 28, 2018 at 22:25
  • does Aqua "purifiy" Hot Spring Water into Normal Hot Water? because that sounds like the total opposite of what normally happens and how you describe the change of water does suggests the opposite (in some anime Hotsprings Water is green and normal water is blue/clear)
    – Memor-X
    Commented May 28, 2018 at 23:14
  • @Memor-X idk how you interpreted it 180 degrees from what I said, but I added some notes to make it clearer.
    – YetAnotherRandomUser
    Commented May 29, 2018 at 22:44
  • @YetAnotherRandomUser "turning it (hot spring water) into "regular hot water"." is how i did, as if it was hot spring water at first then was chnaged to regular water
    – Memor-X
    Commented May 30, 2018 at 0:21

1 Answer 1

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You might be looking for something that's analogous to 温泉 (onsen) vs 銭湯 (sentō) in Japan.

By definition, onsen is hot spring water which (supposedly) contains minerals and other things that makes the bath more healthy and provide relaxation benefits (animated green in KonoSuba), while sentō is normal heated tap water (animated blue).

Aqua purifying the onsen water would have implied that she had taken out all the "impurities" (i.e. the beneficial minerals) in the water, and leaving it with the inferior "just hot water."

Regarding animation, it's not always consistent that onsen water is colored green.

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