With Airocide, there are no filters to change or electrostatic plates to periodically wipe off. You’ll just replace the Reaction Chambers when the indicator light starts blinking, approximately once a year. Unfortunately, due to the high volume of business this month we are out of stock on the APS-200RCK. However, we are taking pre-orders for the products that will arrive on April 19th. If you place an order today, we will ship at that time.