Product review (4 stars): Good evaporator panels
There are no better panels for my 400 series humidifier but I had to take a star way because they only last for about 45 days before they dry out.
I expected that a two pack will last all winter but I was wrong. I have a water softener and thees pads still get some sort of build up at the bottom and stop absorbing water.
That is the only downside.