| http://www.w3.org/ns/prov#value | - I guess the filters is permanent and not replaceable?there isnt a filter in this model. it just released negative ions. what happens is, dust and other particles will bond with the negative ions, thus heavier, and will drop to the floor. so need to clean the floor regularly.i do notice that ever since i started using the filter, whenever i clean the hse, the mop is dirtier. so it works! btfan Jul
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