I have never had water in a butt smell nasty,maybe it doesnt stay in there long enough. Have never cleaned them out in winter as you are supposed to. The only thing I do find, when its really dry, like 2018, we scooped the shower water out, put in a small water butt outside the conservatory, I found if you dont use the "grey" water straight away, it gets bacteria, and stinks. I love you Dove, can you move in please!! The tap the butt thing, I have done a weights workout for many years, (pretty fit and healthy for my age, eldest daughter 50 in September, says I make HER feel old!) Tapping my butt is a "thing", because people cant believe how rock solid my glutes are. Youngest daughter collected kids yesterday, she bashes it at every oportunity, says it hurts her hand!!
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Just don't like feeding plants with stagnant smelling water.