"Ralph" writes:

I have my hole almost done. Went to look at 4" pipe for bottom drain and
found a variety of pipe types. There is "sewer and drain pipe" with styrene
fittings, Schedule 40 & 80 pipe, and corrugated pipe. I ruled out the
corrugated pipe which is flexable because it appears that waste would
collect in the groves. This leaves the sewer pipe and schedule 40. The sewer
is much thinner but I was told this is used for septic systems outdoors and
schedule 40 is used for indoor waste lines. The sewer is also less expense
and seems to have all the necessary fittings I would need. Any guideance
would be appreciated.

Two things in my experience. Sewer pipe cannot be made to connect to
'regular' schedule 40 fittings (that I found anyway), so if you want to connect
to e.g. a bulkhead fitting it won't work. I never found any threaded fittings
and the size is different from regular plumbing fittings and the styrene
doesn't work with PVC solvent weld type glues.

I had problems with pinhole leaks using the recommended glue. If your
pipe is under pressure that prob won't be a problem since the dirt will
eventually plug them. My application was a siphon pipe between two
barrel filters and it would always lose the siphon, I finally spent the
$$ and used regular fittings (the pipe wasn't sched 40 but cheaper
and thinner class 125 but the elbows are what costs the big bucks :-)

Corrugated actually sounds workable to me if you don't need fittings,
I think the stuff that collects in the grooves wouldn't impact flow.
It sure is cheap and easy, not sure if it would work with a pipe boot
into a liner though, prob not. It probably has pinhole leaks too and I know of
no glue for it.

"pipe and fittings and glue, oh my!"

HTH