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Two primary saprobic indices, SPI – the Specific Pollution sensitivity Index and TDI – the Trophic Diatom Index, were studied. Water quality of the upstream and central sections of the Sulejów reservoir were included in the mesosaprobic zone, while downstream stretches of the reservoir (Smardzewice Village) were in the polysaprobic zone. The Sulejów reservoir was found to impact the Pilica river.
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