Sorry if this is slightly OT

My elderly Mother empties teapot down kitchen sink several times a day
claiming tea leaves clear the drain and that a slight gurgling after running
water is the sign of clear drains.She can offer no evidence on these
thoughts but has been emptying pots down for 40 years so she says must be
OK.

The reason I have posted this to the gardening group is my Mother is a keen
gardener and if I can convince her to use the tea leaves for compost heap or
garden she will use them for this purpose but says she will still put some
down sink to clear it !

Any thoughts on suitability for using tea leaves in garden etc or for
clearing sink drain ?

Thanks.

Martin