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Water that does not form a lather easily with soap
the purest form of water as all dissolved and suspended solids, including dissolved gases have been removed
normally contain dissolved gases as well as any organic material which may be dissolved in the water
Biochemical Oxygen Deman (B.O.D)
the amount of dissolved oxygen consumed by biological action when a sample of water is kept at 20oC, in the dark for 5 days
the enrichment of water with nutrients (phosphates and nitrates), which leads to excessive growth of algae
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