Aidan used his keyboard to write :
A tank, pump, float switch &
relay could be rigged up by someone competent.would

Why mess about? If you are putting a pump in a tank, then it would be
simpler to just buy an automatic submersible pump, better known as a
sump pump. You can get quite small sump pumps.

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Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.org