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Arcata in California cleans its wastewater through a series of:

AChlorine dosing tanks
BSix connected marshes
CSlow sand filter beds
DDeep bore tube wells
Answer & Solution
Correct answer: B. Six connected marshes
1. Conventional treatment comes first. 2. Then six connected marshes over 60 hectares purify the water. 3. Friends of the Arcata Marsh maintain it. _Source: syllabus Biology, Chapter 16, Environmental Issues._
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