Gulin Gulin/Bulman (Northern Territory) Hardness
2007/08: Bulman Hardness 336mg/L
2008/09: Bulman Hardness 322mg/L
2009/10: Gulin Gulin Hardness 316mg/L
2010/11: Gulin Gulin Hardness 315mg/L
2013/14: Bulman Hardness 308mg/L
2015/16: Gulin Gulin Hardness 311mg/L
2016/17: Bulman Hardness 296mg/L
2021/22: Bulman Hardness 400mg/L (max), 400mg/L (av.)