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In concentrated amounts and in poor flushing areas, black water from boats can cause a number of problems, including gastroenteritis from contaminated shellfish and toxicity for marine life from the nitrogen and phosphorus in human waste and chemicals in toilet disinfectants and deodorants. During the busy summer months, water testing in the Solent has, in the past, shown a spike in faecal contamination, and whilst a number of contributing factors are possible, The Green Blue is encouraging the recreational boating sector to take a responsible approach.