Meaning of 交換水 in Japanese

It seems that your search contains the following:

Definition of 交換水

こうかん(koukan) 【交換】

(n, vs) exchange; interchange; switching; reciprocity; barter; substitution; replacement; clearing (of checks, cheques)
あなたと席を交換しよう。
Let me exchange seats with you.

みず(mizu) 【水】

(n) water (esp. cool, fresh water, e.g. drinking water) →Related words: 湯
水を加えてペースト状になるまでかき回しなさい。
Add water and stir to a paste.
fluid (esp. in an animal tissue); liquid
flood; floodwaters
(sumo) water offered to wrestlers just prior to a bout →Related words: 力水
(sumo) break granted to wrestlers engaged in a prolonged bout →Related words: 水入り

すい(sui) 【水】

イオンこうかんすい(ionkoukansui) 【イオン交換水】