Originally posted by KateA.
It only removes certain things, maybe only chlorine, I can't remember.
In the paper that comes in the box it says it removed chlorine, neutralizes copper and other harmful heavy metals, stops chloride shock, and adds beneficial electrolytes and will not change the pH. Stimulates the natural protective slime coat to help heal wounds and torn fins. Reduces stress.
The fish could die just from being exposed to untreated water.
I have kept my fish in this same untreated water for years, 2 of the fish I have now Ive had since I was 5 or 6 years old. The only reason I want to use the conditioner is because I will hopefully be adding rams to this particular tank, and using the conditioner will give me peace of mind.