Marta MT-1351 Bedienungsanleitung Seite 10

REPLACING THE DUST-CUP
When the dust reach to the 1/4 level in the dust-cup, it means dust-cup is full. At this moment, dust-cup should be emptied and the filter should be washed.
Open the dust-cup as showing in the picture.
MAINTENANCE:
The filter should often be cleaned when it is dirty and suggest to be replaced after using 100 hours or so in order to avoid barrier.
When the HEPA-filter is full of dust, it should be cleaned.
ATTENTION:
Don't wash the filter in the washing machine or dry it with electrical heater, please refix it after drying the filter in the air.
Don't clean the outer-shell of vacuum cleaner in petrol oil-like liquid. Please rub it with water and soft soap liquid.
Don't clean the machine with the cloth full of water. Don't let the water flow into the vacuum cleaner.
Use only as described in manual.
Only use manufacturers recommended attachments.
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MT-1351