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Why not just install an overrun / timer relay on the pump so when it looses switch live it runs the pump for 10 mins etc
Eg
Eg
AC 230V 16A 1SPDT Multifunction Timer Relay On Off Time Delay Relay for Home | eBay
Output: 16A 1SPDT. 1 function of latching relay ( I ). There might be a bit of color distortions due to different computer resolutions.
www.ebay.co.uk