Product review (4 stars): First time refilling filter
This product is exactly as advertised.  The steps were easy to follow and they give you everything you need.  First time for me using the granules myself.  The filter doesn't seem to process air properly though, upon using.  Not sure if it's something I did wrong or what?  The humidifier will inconsistently think it's out of water because air/water stops flowing through the filter.  I have to shake out the air bubbles for it to work again.