Product review (4 stars): Long lasting, well made filter wicks that work
These filters when used in a Essick Air HD1407 Moist Air Whole House Humidifier are very effective at humidifying a home as large as 3000 or 4000 square feet, provided that you have forced air circulation to move the humidified air throughout the whole interior. They are extraordinarily effective in the area in which the blower can distribute the air flow.  They are well made, fairly sturdy, and can be rinsed occasionally with warm soapy water to prevent mold build-up, and can be cleansed with CLR if the water used is high in mineral content. Provided that you keep them rinsed and free of mineral build-up, and clean them gently, they perform for four or five months and keep humidity levels above 30% and well above that if your house usually is at more than 20% winter humidity or better. They will last an entire season if cared for properly and not torn by careless handling.  Overall, they work remarkably well.