Question about Honeywell HE220A1019 Whole House Humidifier Humidifier

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Humidifier filter clogged in one month with white residue

What causes the residue?

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  • gyale28e Jan 27, 2009

    We tested the water from the well and after leaving the water softener. This is limestone country, so calcium was what we expected. The results show the calcium content is high going into the softener and low coming out. The guy who installed the humidifier has never senn anything like our problem.

    We did change from salt crystals to salt pellets in the water softener. Does anyone have experience with salt pellets in a water softener? Any problems?



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Thanks for you question,
the residue that you are seeing is Calcium, it is a natural mineral that is found in all water, the easiest way to remove the calcium build up from your humidifier screen is to use (CLR) it is a calcium, lime and rust remover, a simple diluted mixture with water, then soak the screen for about half an hour, rinse the screen then reinstall, a soft water system would help with the calcium build up as well, but tend to be alittle on the spendy side, your could try inline mineral filters that need replacing yearly, I really hope that helped ansewr your question, let us know with some feed back, thanks again for your question, mr.grzz

Posted on Jan 21, 2009


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As the previous poster said, it's probably a problem with your water.

Are you using tap water or bottled mineral water? If so, there are minerals which get nebulized along with the water, and leaves a white, dusty, residue. I fill my Crane Pig humidifier with DISTILLED water, which is pretty pure. Make sure that the water is DISTILLED ONLY, since some of the water companies distill the water and then add minerals back in (they almost got me here until I noticed the label that said "with minerals added"). The reason this is important is because during the distilling process, the water is boiled, evaporated, and then the vapor is condensed back to liquid. This removes any impurities or dissolved minerals from the water. You can see Wikipedia for more on this topic here.

Additionally, I use both the Crane Demineralization Filter Cartridge (which works for the penguin as well, and gets installed in place of the original water tank cap), and the ProTec PC-1 Humidifier Tank Cleaning Cartridge (which I plop into the water tank) to keep the water both de-mineralized and bacteria free. I got both products at

With these 3 things, so far I haven't had any white dust residue, and the mist feels fresh and clean.

On a side note, by using distilled water, you also prevent any mineralization from building up on the nebulizer or water level sensor, which can cause the humidifier to eventually stop producing mist...

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