How to re-fill an airless bottles?

How to re-fill an airless bottles?

1. Use a spatula or stick to push down the inner disk. 
2. Add product into the bottle 
3. Tapping the bottle to settle the product, make sure no air is trapped inside the product 
4. Add more product until it is around 3/4 full or more 
5. Press down the pump and feel air is being pumped out, initial few pumps are jet of product mixed with air 
6. Until the top of product touch the tip of pump, smooth flow of product will be pumped out IMG_4150-13