Bissell Antimicrobial 3645 filter for CrossWave FreshStart

Bissell Antimicrobial 3645 — wet & dry floor washer filter for the CrossWave FreshStart. In a wet floor washer the filter sits between the dirty water tank and the motor and catches damp mist rather than dust. That is why it wears out faster than a dry one: if the machine smells musty after cleaning and suction has dropped, the filter is almost always the reason, not the tank.