Changing the PECO-Filter in your air purifier is simple. First, turn off and unplug the device. Then, locate the filter’s access panel. This is usually situated on the back or side of the unit depending on the model. Carefully remove the old one by pulling it straight out of the product and dispose of it properly. Next, take the new PECO-Filter out of its packaging and remove the protective plastic covering. Align it so the arrow on the filter aligns with the arrow on the device. Gently slide it in place until it clicks securely. Once completed, close the access panel, plug the purifier back in, and turn it on.