On May 7, 11:05*am, "Pete C." wrote:

A properly sized system that is only fed digestible
waste and sufficient water may never need to be pumped.

That's all I put in mine. It was pumped out for the 1st time after 10
years usage.
It had less than 2" of sludge on the bottom so the service guy said
I'd probably never have to have it pumped out again.

KC