Product review (5 stars): The Right Filter For Essick MA0800 Humidifier!
We purchased this filter to replace a universal filter in our mothers Essick MA0800 Humidifier. The old universal filter that was bought for her at Lowes had a light fabric type outer wrap & she had to cut it & piece it together to mark it fit. This old filter was terrible, her humidifier would run for days without using up any water. The worst part was that it developed mold on the bottom edges & she & her daughter had been having recurring illness. It also was the cause of her apartment smelling like a locker room (in her words). We installed this filter in her humidifier after cleaning it with Peroxide & also bought her some bacteriostat to add to the water. The humidifier is happy again & working like new again. Be careful when substituting the original filter with a universal filter, if the universal filter has a fabric outer lining watch your humidifier carefully. She thought she was going to need a new humidifier, but now she is very happy. The original filter is a Essick MAF2  and is round in shape out of the box, not flat.