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If you have been looking at rainwater harvesting, you may have come across the term “first flush”. It sounds logical: the first rain falling on a roof washes away dust, pollen, bird droppings and other accumulated debris, so why not divert that water away and only collect the cleaner rain that follows? The answer is that first-flush systems can be useful in climates like parts of Australia where they have prolonged antecedent dry periods, rainfall intensity and the amount/type of mat …