This is the same as Calbe N 113.
It is said to last very long in a tray. Just fill it an a bottle after usage and reuse it.
I suppose there are two bags of chemicals, A and B.
Mix A in ca. 4 l warm (not hot) water until completely dissolved. Add B and stir until dissolved. Fill up to 5l.
I mix all powders 24h before usage.