Lemon immersed in a glass of water – What does it mean?

We normally witness many of the shopkeepers or hotel owners or in offices there will be a fine glass tumbler will with water with a lemon in it. Why do you think they do this thing? Is there any particular reason for that? Is it for inflow of abundance or Good luck? To drive away evil eye effects?  What happens when a lemon is kept immersed in water in a glass tumbler?

Let us find out the secret behind this doing.