I’m thinking of doing this but with a grey water butt beneath the bathroom window. This summer we have showered with buckets on the shower floor and get about 20l a day on the beds that way.
My plan is to use the grey water from the butt the next day for watering with cans, and direct whatever's left on to the garden with a hose connected to the butt tap. Just waiting for a new tap to be delivered (the old one broke so I've ordered a new one with a push-fit for a hose). Last night's bathwater went straight on to the garden (all on one spot) and this morning it's soaked in so well that I can hardly tell it was there.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
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For anyone interested there are also small pumps available powered by an electric drill or screwdriver
It wouldn't work for me - I bath/shower last thing at night and I don't want to be mucking about outside in the dark in my nightie