So here we have 冫+咸 (or 氵+咸) = 减(減).
减(減) means something along the lines of reduce/subtract/decrease/diminish or what have you.
What has water got to do with this though?
Logically one would imagine 冫 (water) + 咸 (salty) = a reducing of flavor, thus giving reduce/subtract/etc.
Phonetic Signific, of water 氵水 - can pour out of - decrease
So what's the deal?
What's going on here?