How to Prime Fluoride Filters with Priming Button Priming with the thick tan washer, known as the priming button, is the method for priming Fluoride Filters. A priming button is included with every Fluoride Filter purchase. 1. With the blue caps in place, wash the exterior of each fluoride filter element with water and mild dishwashing soap, then rinse. 2. With clean hands, remove both blue caps from each end of both filter elements. 3. Place the rubber priming button (tan colored) onto one end of a fluoride filter and align the hole of the filter with the hole of the rubber washer. 4. Press the priming button up against the sink faucet so that the priming button creates a seal between the faucet and the Fluoride Filter. Place your thumb on top of the faucet to apply pressure to create a better seal (as shown in picture). 5. While holding the priming button against the faucet, turn on the cold water slowly, allowing water to fill the cavity of the filter and flow from the opposite end. 6. Allow water to flow for at least 2 minutes or until water runs clear. 7. Turn the Fluoride filter over and prime the opposite end (reversing the flow of water) by repeating steps 35 until water runs clear from both directions. 8. To determine if the filter is fully primed, collect the filtered water in a clear glass and hold it up to the light to see if all cloudiness is gone. If not, continue priming until water is clear. 9. This filter is now primed and ready to install. 10. Repeat priming steps 17 for each additional Fluoride Filter. Note: Different factory batches may have different appearance labels, which do not affect the use of the product. Material: Activated carbon Color: As shown Package Contents: 2 x Water Filter Note: Light reflection and different displays may cause the color of the product to vary slightly.