Makes safe for drinking, as water

• Treats sea water
• Makes drinkable, as seawater
• Makes potable, in a way
• Makes potable, perhaps
• Makes seawater potable
• Makes drinkable, in a way
• Processes seawater
• Treats seawater, perhaps

Wiktionary Word definitions in Wiktionary
vb. (en-third-person singular of: desalt )