While this is intresting and all keep in mind that tap water in Poland is not really safe to drink and almost all people of poland would agree on that.<br>Almost all polish water sources are polluted (by their own doing btw). <br><br>And many water companies have to mix in CHLORINE to actually make the water clean enough for EU regulations.<br><br>I would never drink chlorine water and neither should you... it is NOT safe. <br><br>So im very much questioning what these clams are actually able to detect, because the tap water in Poland is not good.,(reply>), Polish tap water is perfectly safe. It's just not common to drink it because it USED TO be polluted in communist time and Poles distrust everything that comes from the government instinctively.