In article ,
Peter Breed wrote:

Yesterday the hose from my pump to pressurised filter came of putting
about 1/4 of the contents of my pond mainly over next doors garden.
Fortunately I was about and was in time to switch of the pump before all
the water had gone.
I was wondering if anyone had come across a device to cut off the pump
if the water level got too low?
Peter Breed

I've certainly been down that path. I know some people have devised
toilet bowl-like devices for that. I now keep my pump a few inches off
the bottom. Never lost a fish, but had my pond look like a sardine can a
couple times.

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