*Money Saving 3-Pack* When you order this product, you will save $1.50 off of the normal retail filter price. You will receive 3 replacement water panel evaporator filters. The filter is aluminum with a line denoting the top of the filter and is coated with a powdery substance that allows the water to move more slowly over the filter thereby permitting the maximum amount of water to be absorbed into the air. Detailed step-by-step replacement instructions are included on the back of the box. Please note, do NOT discard the scale control insert (plastic filter casing) you will need this for the replacement filter. The water panel evaporator filter should be inspected bi-monthly but is rated to last up to one heating season under normal operating conditions. This high quality replacement filter is manufactured by Research Products Corporation. Save $1.50 when you order the 3-Pack.