Empty "used" soil from containers?


Hi I'm looking for advice regarding container gardening. I've had a couple smallish containers this year where I grew courgettes, beans and peas. I generally like the idea o f no dig, but as the containers are so small I don't know if all the nutrients are already "used up". Should I empty the soils from them and mix in new compost for next year or do you keep the soil and just top up? TIA

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