"pat" wrote in :

How much liquid should be left on the bottom of a septic tank after
being cleaned 1", 2" or more?



Well, if you're paying them to pump a 1000 gal tank and a part of the total
charge is a dumping fee for 1000 gal, let them take 1000 gal.

The bottom of the tank contains sludge. Sludge is normal. Under normal
operation sludge is constantly being decomposed and replaced by new sludge.
Too much sludge can cause failure.

From http://extension.umd.edu/environment...es/septic.html

"Hire a licensed professional (listed in the phone book under "septic tank
cleaners") to pump the waste out of your tank. The tank should be pumped
out through the manhole, not the smaller inspection ports. The tank should
be cleaned completely, leaving nothing in the tank. Make sure the baffles
are inspected and that the tank is checked for leaks."