best way to get polluted water out of a pool of otherwise clean water?

[Mr W]

A chunk of polluted ice dropped into my water supply from above. Now I have a section of my water with polluted water in it. What is a good way to restore it to its pristine state?

[gimmethegepgun]

Oddly enough, you can mop liquids that are completely submerged in another liquid, as long as the amount of the liquid you want to mop is low enough. So if a little bit of pee gets in you can mop it on the bottom.
If it's not on the bottom you can build mesh tiles to make a floor to stand on.

Another way, which will result in the destruction of the polluted water, is to build tiles over the offending liquid. If all surrounding tiles are filled by a different liquid then doing so will delete the liquid on the tile instead of displacing it.

Yet another way is to use a Pitcher Pump. If a pitcher pump is touching multiple liquids, dupes will effortlessly and perfectly draw only the liquid that they're after, so use that with an auto-bottle liquid dropoff for polluted water to have your dupes pull it out.

[zverozvero]

If you use water from pool through powered Pump include water sieve into pipeline. It'll let clean water through without using power or filtration but cleans p-water.
If you use water through pitcher pump you dont need to clean anything - dupes can choose needed liquid if pitcher has tubes in several types of it.

[gimmethegepgun]

Originally posted by zverozvero:

If you use water from pool through powered Pump include water sieve into pipeline. It'll let clean water through without using power or filtration but cleans p-water.

Be careful with this option though, since the pwater is from melted pice, it might be cold enough to freeze once it gets sieved.

[Frank]

put a pitcher pump over the spot so the straw is in the p water, use a bottle emptier over a spot u want the p water to be in, set bottle emptier to "enable auto bottle" and set high priority on the bottle emptier to get it done quicker