Fresh water editor Neutralizes the poisonous heavy metal compounds, e.g.: Lead, cadmium, copper, zinc; straight also in the fresh tap water.
Neutralizes chlorine in the tap water.
Stabilizes the pH value.
Skin and Kiemen of the aquarium fish protect against to strong bacteria settling with organic colloids. Particularly importantly with skin injuries!
Very helpfully after final welfare treatment for recovery.
Protects the fish in the case of transport.
Power tap water fish-friendly.
So that itself all your Zierfi probably-felt!