Septic tank for waste disposal system

Claim 1

A waste tank having first and second chambers, an inlet opening in said tank to said first chamber, an inlet opening in sad tank to said second chamber, an outlet opening in said tank for said second chamber, said first chamber having an upper portion and a lower portion, a connecting conduit connecting said first and second chambers, said connecting conduit having an inlet end and an outlet end, said inlet end being positioned in said first chamber intermediate said upper and lower portions, said outlet end being positioned in said second chamber, said connecting conduit including flow control means responsive to liquid level in said first chamber for transferring liquid to said second chamber from a position substantially below the surface of liquid in said first chamber only when the surface of a liquid in said first chamber is substantially above said inlet end, said inlet opening to said first chamber being connected with a first source of waste products having a high percentage of pollutants and said inlet opening to said second chamber being connected with a second source of waste products having a low percentage of pollutants, said flow control means including valve means in said connecting conduit and sensing means for sensing the liquid level in said first chamber, said sensing means cooperating with said valve means for selectively opening and closing said valve means responsive to changes in the liquid level in said first chamber.