2 in each Pack! Replacement wicks for the Bemis Humidifiers: 500 Series, 726-000, 737-600, 736-200, 726-905, 7370 and DP3-200. Filters are typically changed once per year. However, if you have pets or smoke in the home, at least twice per year is recommended. Please check our "Filter Reminder" checkbox on the first page of the checkout, and we'll send you an email reminder to change your filters. Availability: Usually ships in 3-4 business days. 1040$10.95, 2/$17.90, 6/$52.80 Schill's, llc 103 Curtis Street Arlington, WI 53911 Limited Hours Customer Service: 888-528-0225 Email: Info@Schills-Humidifier.com Fax: 608-592-3205 Manufacturer's Numbers: Aprilaire: 800-334-6011 Broan Fan/Heater Questions: 800-637-1453 Delta Faucet Questions: 800-345-3358 Grohe Faucet Questions: 630-582-7711 Hart & Cooley Questions: 616-656-8200 Kohler Faucet Questions: 800-456-4537 Moen Faucet Questions: 800-289-6636 Stiebel-Eltron: 800-582-8423