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Title: Unfortunately, one size does not fit all.
Review: I had ordered the Sunbeam Model 6589 Ultrasonic Demineralization Cartridge but was sent the DC-51 as a replacement because the 6589 is no longer being manufactured. Unfortunately, the DC-51 is about 1/2" thicker than the original 6589 and that extra thickness prevented the tank for my Sunbeam Model 701 Ultrasonic Humidifier from being able to seat properly. I am unable to use purified water with my Sunbeam, so the dreaded "white dust" problem made it necessary to return the entire humidifier because there is no usable demineralization cartridge available for it.A very poor job of coordinating specifications for a replacement of a discontinued product, in my opinion. I suspect that some other Sunbeam Ultrasonic Humidifiers will have similar problems using the Kaz DC-51 as a replacement for the 6589 because of their similar design.
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