I don't know why I had this problem and I'm not sure if I blame the filter can because it seems to me I have used this brand before and it has not happened. However, after about a week of use, I only had to replace this filter at night due to mold growth. Maybe I did something wrong with the block. I'm just saying I was very disappointed that I didn't get more benefit from it, although in the past it seemed like I wouldn't see mold for maybe a month. I have no intention of buying this brand again. Update January 14, 2014: Apparently I still need filters for my humidifiers, so I tried again. I'm happy to sign up with no problems. I actually used a water treatment the last time I had a mold problem and am now continuing the water treatment with no problems. I suspect it was a poor quality filter, or maybe the problem was mine for not adding enough water treatment during my first experience with the filter. Anyway, now I feel ok to recommend this product.
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