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7.0 (neutral) or slightly lower, to be compared with approximately 8.0 for seawater. Together with humic substances this sometimes causes a bit brownish water colour, especially in the inner parts. The salinity varies between freshwater and brackish water with poor salinity. In the outer parts of the archipelago, the salinity reaches around 0.6-0.7 per cent by weight, to be compared with at least 1.5 for beginning to taste salty and around 3.0 or more for proper

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