Beltfilters for purification of liquids like water, cooling lubricants, emulsions.
The dirt particals held by the filterfabric.
A filtercake on the fabric funcioned as a filter.

By building up a filtercake the liquid level will go up.
At a certain level a switch moves the filterfabric roll to a new filtration area.

How many filterfabric is needed will be decided by the amounth of dirt particals.

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