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YOU WILL SEE THAT WHEN IT GETS CLOGGED IT WILL SUCK ITSELF IN THE MIDDLE, GIVING IT THE HOUR GLASS SHAPE. THE PROBLEM WITH THE FILTER IS THAT IT IS EXPENSIVE TO REPLACE EVERY 6 TO 9 MONTHS. ABOUT $100.00. ALSO YOU ARENT SUPPOSED TO WASH IT. JUST LEAVE IT ALONE AND THEN CHANGE IT WHEN IT GETS THAT HOUR GLASS SHAPE. JUST MY 2 CENTS