a. Michigan
b. Utah
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d. Hawaii
a. One day per week
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c. Three days per week
d. Four days per week
a. Greywater may contain sewage while blackwater comes from sinks, washing machines and other appliances apart from toilets.
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c. Blackwater becomes graywater after undergoing a dichlorination process.
d. It is a distinction without a difference – both are names for unpotable water.