Duplicates using contaminated water in machines

What i would love is for them to use the contaminated water but whatever it is put into is reduced in efficiency by a lot

Are you sure they pick up 1000kg and not gramm?

Probably grams. This bug happens whenever the closest water source to machines is contaminated, this bug wastes a lot of time if contaminated water gets into the colonies main water supply.

I never saw dupes pick up contaminated water. They can pick up clean water even if it is next to contaminated water.

The dupes storage says contaminated water?

Just had the exact same issue crop up in my game.  I was setting up a new drain pipe setup to clean contaminated water above my main water supply when sandstone decided to be it's normal self and dropped, allowing the water out before I  had set up retaining walls around the intake pump.  Once it made it into my main reservoir my dupes ended up dying because they would only pull contaminated water out of the main reservoir to put into my terrariums, which would start for a half second, dump the contaminated water, and instantly shut off.  They just ran in a loop doing that until they ran out of oxygen.  They refused to use a secondary source of pure water that was located farther away.