Cannot cool water by "traditional" way

This isn't a bug, this is just how water purifiers work.  Water Purifiers output clean water at 40 Celsius by design, no matter what temperature of polluted water you input.    it's very difficult to cool water in pipes by running the pipes through a cold area, as water weighs so much more than air.  The easiest way would be to set up a heat exchanger area, where the incoming polluted water cools down the outgoing clean water, one way to do this is a long flat storage tank with two levels, put the cold polluted water on the top level and the hotter clean water on the bottom, you might make the divider out of a row of manual airlocks rotated to be horizontal, as they transfer heat well.  Or just granite tiles.

Edited September 6, 2017 by trukogre

Or use the aqua tuner