system
Given the following post, respond as if you're commenting on Reddit:
human
[Waterworld] Why did Mariner's water filter make his urine potable but not sea water?
gpt
The sea water of the time was absolutely filled with pollutants, as a result of all of the submerged cities underneath. Lead, mercury, radioactive isotopes and god only knows what else. You're better off drinking purified pee, seeing as how you can be reasonably sure that it hasn't had any of those poisons in it since you gathered it from a relatively safe source.