We purchase bromine water rather than preparing our own. Serious safety measures are required if using bromine. If all you want is bromine water, better to just buy it.
I work in the Canberra Goulburn Archdiocese Catholic System. I only work in term time and I get all the holidays teachers get. My pay is "averaged" (ie a bit lower) so that I get paid all year round. My award also allows for school staff who work 48 weeks a year and under that arrangement ...