At random, polluted water is expontaneuosly generated (or teletransported) in a not totally random manner. The polluted water is really cold, as it were from the cold biome. At first I thought that was my mistake (cycle circa 150 and circa 180), so I made a filtering system to avoid it until I found the polluted water source. BUT, in the cycle 192 pw appear in a place without a reason to be. The place is where the electrolizers. There are no storage bins nor paths to them in that place. but the places affected are close to the cold biome.
The only clue that I have, it that the bug started when I started mining the cold biome. My theory is that when I mined polluted ice, the generation of the debris fails to be in the same place that were it was mined. But I was not able to reproduce.
I attach the save file with the last auto saves to show what happened.
maybe mine polluted ice pray to be teletransported.