You’re reading the Canada Letter newsletter.Backstories and analysis from our Canadian correspondents, plus a handpicked selection of our recent Canada-related coverage. Get it sent to your inbox. When Parliament passed a law last month banning misle

Your favorite laundry detergent sends stains and smells packing. But where do those suds go once your clothes are clean? Most wastewater treatment systems were built to extract just what “we flush down the toilet” before the treated water is release