"Vince" wrote in message
...

Let me describe my situation as best I can.

This is a private 3 bedroom residence located on Long Island, NY.

Just had a backup of wasteline, which is below foundation, into our
unfinished basement. The main line was cleaned; papertowels were
found. However, today when doing the laundry, I saw some water backup
in the (future/rough plumbing for a) shower drain pipe, i.e., the low
point.

The property survey map shows that there is a septic tank with a Y
output piping to two overflow pits. I believe that the overflow pits
are the precast concrete type, but have not ever seen them nor do I
know their size/capacity. The location of the septic tank, which has
a standpipe from a previous service event, and the location of the
overflow pits are indicated on the property survey map document. The
overflow pits most likely do not include standpipes, as they have
never been serviced.

I am arranging for a draining of the septic tank.

The guy that did the mainline cleaning wants to install a standpipe at
one of the two overflow pits and add chemicals (35$ per 5 gallons and
he recommends 15 gallons) to that pit. Is that the way to go ?

I am thinking that a septic tank draining is the next step, and
possibly the last step needed at this time.


I just went through a septic dilemma myself. I had backup into the house.
I had the tank pumped (not drained?).
Upon pumping, I found the cleanout at the entrance to the tank was full of
toilet paper. I cleaned that out and it seemed to work just fine, for
awhile.
I notice the waste level rising faster than it should over the next few days
and called in the experts. As it turns out, my drain field was in fact
saturated
and I needed to build a new one. I'm not familiar with "overflow pits" but
if you've got them, then you've got them. Ultimately, I would think you
should have a drain field as well which may be saturated. It could also be
as simple as the outflow pipe is also clogged. There should be an access
hatch towards the back of the septic where you can inspect this. I would
inspect this area first and if nothing is found, then you should think about
your drain field. Look for wet spots in your field and that is a sure
indicator that it's saturated. Mine had not but was still saturated. As
for adding chemicals, just what is this guy recommending you add? Septics
should run on their own with no additives, certainly not bacteria killing
chemicals. The septic works on the principle of bacteria "eating" up the
waste and leaving grey water which then flows out to the field. Adding
chems (even bleach from the washer) will kill off the septic process and
lead to an over abundance of solids which will cause problems. I'm no
expert (although I feel like one in regards to my system now) but if the
outflow is not clogged and your drainlines are clear, then you're looking at
a saturated drain field.
Not sure if that helps but good luck.
cc