This from a friend of mine:
(I'll forward any replies to him.)
Trying to trouble shoot my drain problem. At first,
I thought the stack vent was clogged. When I run a
drain in my trailer, it comes backup some other drain.
My trailer is on my old family property. Used to be
a house here, but that fell down twenty or so year
It burned down. there was a couple of trailers here
before that, last opne was about 10 Years ago.
The trailer is maybe twenty feet from the septic tank.
It is connected with four inch ABS, and we snaked it
before I moved in, and set up my trailer,.
So, the drain is getting worse. I finally found
the clean out plug, which is right before the
septic tank. Pulled the plug out, and a lot
of dirty water came out.
The cleanout is right next to my trailer, as
per county code. The sewer line is only about
3 to 6 inches deep. when I unscrewed the cap
from the clean out, I had a shit geyer for a
few seconds. the clean out is roughly 20 feet
from the Septic tank. it is an old Cement
Block septic tank. My uncle built it in 1957.
Before that the house had an outhouse.
As for now, I'm trying to figure out what
might be holding the system back. Wonder if
the tank is clogged, or maybe the leach field?
Since the septic tank is made of 4" Cinder
Block, if worse comes to worse, I would think
there would be SOME leaching action as the
water seeps through the somewhat porous block.