Meh 2500L tank just for cars plus a karcher. Life is good.
Edit: Just on industry usage; you would be amazed at how much water they use, but in Melbourne industry uses less than residential and over the past 5 years have saved more water than the residential population. Eg the place where I work dropped from 200ML/yr to around 70ML/yr, so they more than halved it. Not many households can claim that.
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