I bought this steam cleaner because I have 2 young children who play on the floor alot.  I wanted something easy to use, that I could pull out frequently and run often.  I use my machine on average every 3 weeks.  And even at that frequency I dump out some pretty nasty looking water.  I love that the carpets dry quickly after I am done, that is the key.  If they didnt dry fast than I would know that it wasnt getting all the water sucked back up.  I end up getting the change in pitch letting me know that the dirty water tank needs emptied way before I've run out of clean water.

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