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6 Responses to “Is it OK to put coffee grounds down the kitchen sink drain?”
the grounds like to clump, even with flowing water. (like how annoying it can be to clean out a french press because the grounds just keep sticking to the glass 😉 eventually enough of them will stick together in the drain or get lodged and cause a clog, especially if you’re in the habit of pouring vegetable or animal fats down the drain, or if you’re a daily coffee drinker.
grounds make excellent compost, but they are really acidic and so should be added to a compost pile. applying directly to houseplants might harm your prized plants.