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Cleaning of filter of coarse impurities

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 1. Take out the hoses for air supply from the nozzles of raw water air-lift pump and of the air-lift pump for coarse filter aeration carefully. Remove the hoses in a parallel way with the axis of the nozzle – do not move with it side to side!

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 2. Unfix the hose for raw water pumping from the hanger on the WWTP wall.

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3. Take out the raw water air-lift pump from the filter of coarse impurities.

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4. Remove the filter of coarse impurities from the hanger and take it out of the WWTP.

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5. Clean the filter from settled impurities.

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6. In the end, rinse the pipe with a stream of pure water.

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