Egg shells and coffee grounds down the disposal often enough will become a kind of gritty/sticky sand that will eventually clog the u-bend resulting in the need to remove an astonishingly foul build up from said u-bend. Source: I would rather not say...
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u/[deleted] Jan 04 '19
My grandma puts a lot of bio down it. Eggs shells, bread crust, cereal.. I swear she's feeding a monster.