Ok, I'm new to this site and also new to South Carolina and plumbing..I have a "grease pit" outside my kitchen window (of course in the ground)..My kitchen sink backs up - I've snaked it, liquid plumbered it, plunged it...it feels like a solid block when I snake it..I did at one time see bubbles from my dish soap in the pit but no longer see that..I'm totally stumped..how do you clean the pit? Is there a chemical to put in the hole in the ground into the pit? I have no garbage disposal - it's an older home..my septic is all the way on the other side of the house - all advice is welcomed..thanks...New country girl.