On Feb 16, 11:30 am, "EXT" wrote:
While authorities will insist on the laundry water be drained through the
septic tank, it is one of the worst things you could do. Many years ago
before synthetics, cotton, wool and flax fibers and lint would break down in
the tank along with the normal waste products. However, polyester, nylon and
other synthetics do not break down. They sit inside the tank or flush out
into the drainage field and slowly over time build up a matte of synthetic
fibers throughout the drainage field causing it to eventually clog up and
need replacing.

Agreed. When my sewer system starts acting up, I run a sewer snake in
there and pull out gobs of lint. Didn't have the problem when the
washers had internal lint catchers, but now they catch the lint and
backflush it on the drain cycle. I can imagine they cause lots of
problems in a septic tank/field.