yes I am fully aware of that, this is why I am going for a 200ft deep bore this time. Earlier we had an 80ft bore, it served us for almost a decade but now it has dried, the water was not suitable for drinking but we regularly used it for washing, bath etc. (it felt like heaven when I took bath with its icy cold water in scorching afternoons of July, I really miss it now)
The deeper the bore is the cleaner the water gets, a 200ft bore is more than enough in my area considering that 80ft bore wasn't that bad either... and obviously I am not going for crystal clear stream of water 
