Question about Aprilaire 550 Humidifier
You need to replace you humidifier pad. The water scales up on the pad and this is the white powdery substance you are getting.
Posted on Feb 02, 2010
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Posted on Jan 02, 2017
Tips for a great answer:
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Try white vinegar instead. The same type of scale builds
up in drip coffee makers. Most recommend white vinegar to remove the scale that
builds up over time. The added bonus is it costs less and is completely safe. If your unit is a water over paper media humidifier, you would be much easier to replace the paper media.
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