On Sep 30, 11:44 am, "newman" wrote:
Is it advisable to put coffee grounds in septic tanks?

I have heard that coffee grounds do not decompose.

Thanks.

You can put all kinds of organic matter in a septic tank. People with
septic tanks have garbage disposals after all. You just have to have
it pumped out more often. It's not rocket science. Ignore the
hysterics.

Google septic tank pumping chart.