On 14 Dec 2005 08:52:00 -0800, Harry K wrote:

When a septic tank does give trouble it is because it is full
up with solids, those solids are moving into the drain field. Once that
clogs you are in for replacing the field.

This in fact is exactly what happened to us. Had a nice small septic tank
for two people. Didn't cause any trouble for twenty years. Then it start
bubbling up and backing up. New drain field time.

Edward