It is true that salt water is very good for pink eyes. As to pink eyes, it is called conjunctivitis in medical term. There are three types of conjunctivitis based on three different triggers, bacteria, virus and allergies. The common symptoms of conjunctivitis include redness, increased sensitivity to light, secretion and grittiness and so on. Allergic conjunctivitis don't last long, as long as you are away from allergen, it could heal up very soon. Bacterial and viral conjunctivitis last longer. With saline solution, which is disinfectant, we can wash eyes thoroughly, which can make you feel much better. It washed secretion out of eyes, and the crust formed around eyes. It could help clear up the infections quickly. Using an eye cup filled with saline water to wash eyes or applying some drops into eyes both are helpful. Besides of saline solution, you can use breast milk in the same way for little babies. This is recommended by many nurses, who told me it is much better than antibiotics medication.