These are by far the best feeders! I have had them for years and have 14 of them filled at once (lots of hummingbirds). They love the rail and 12 hummers can and will  sit, share the six holes, and alternate drinking the sugar water at the same time. Please NEVER add the red food color (it's bad for them and they don't need it).  Sugar water ratio: 4 cups water to 1 cup sugar:  Bring water to boil, add sugar, stir and boil for 3 minutes, cool. Double, triple, or quadruple the amount and store the rest in the fridge. Remember to change the water every 3-5 days depending on how hot it is. Best to start with a small amount of juice until you see how many hummers you have.  To clean, rinse in hot water/ run bottom in bottom section/fill top section half way and shake and rinse again. These feeders are very durable and strong and last forever and the hummingbirds love them.