Having had aquariums with tropical fish and a few episodes with the Triops, I only know too well what you talk about.
Getting the water right for the animals needs is a very delicate business, and getting it wrong quickly leads to total desaster.
One problem is - I think I spoke about this before - that clean doesn't equal suitable for the animals. Here in Germany, we don't use Chlorine or Fluorine in drinking water, and else its also pretty clean. However, using it for aquariums requires a lot of preparation, to provide a healthy micro-boilogical environment for the fish. If you would drink the stuff, you may spend the next 2 days on the toilet, but the fish need it like that.
That makes it extra difficult if something goes wrong with the water. You cant simply replace the bad water by fresh, clean water - that would kill the fish as well.
The Triops are pretty particular with their water, too, especially for getting them to hatch and then grow out of their juvenile stage.
To hatch they need almost destilled water, without any salts or minerals at all. As juveniles they need water with certain bacteria and algae in it, because thats what they can eat. They are incredibly small at first. Strangely enough, they are extremely tough once they have their adult form. They can live in clean water or mud water, it can be 20C or 33C - they dont care, as long as there is enough food around. And they can eat just about everything that is soft enough.