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BTW RHS recommend using grey water within 24hrs, do you have any concerns about bacteria breeding in the butt? I was looking in to this too recently and might be tempted to fit a diverter valve on the bath waste eventually (once I've grown something to water) so it would go directly on to the plants via some sort of irrigation pipe.
We’ve recently bought a Hilka multi-purpose siphon kit from Screwfix, mainly to transfer dirty bath water to a water butt in the garden to water plants with. For £10 it’s great. Might be worth a look for what you need?