Yesterday morning the pit cesspool backed up so I called for a pump out and went out and dug up the lid. It's my own fault since I had procrastinated on getting it pumped, I'm now figuring it probably has been 7 years. Yep, it was full. The two issues that didn't help are the very wet weather we have been having and the fact that since the cesspool was built (probably in the late 1930's) silt and dirt has found it's way into the tank and settled on the bottom, on the sides it is around 2 feet deep, less in the middle. This stuff is a thick muck and the suction from the septic truck can't remove it. I know it's dirt because it's the color of mud. It's reduced the capacity of the tank. I'm trying to figure out a way to remove it.
After the pumping I got the hose and sprayed the blocks and the gaps between them. The waste line to the house was clogged since the level in the cesspool was above the line entry point, had to snake it out. All in all it was a fun day!
Now I'm sticking to a 2 or 3 year schedule on the pump outs and lots of friendly bacteria additions.