| I think there is another part to the effect that a submersible pump could have. As part of filter cleaning it would be shut off and then turned back on. This would be done infrequently in a well designed filter system with passive settlement that oould be dumped by valve turning daily, that's true, but this type of pump would be more likely to be associated with a system that contained a "pond" filter from some manufacturer who considers that degree of solids filtration for nuts only.
When a motor starts up there is a field of energy created around it and fish near enough to it and small enough or weak enough would be affected by this charge. This is not a malfunction of a pump, has nothing to do with GFI, and is more pronounced in larger pumps.
These are all beliefs that I have based on reading. I am not an engineer, though Daddy was, and can't back this up with quotes or sites, or cites, or links. An engineer may wish to back me and my memories up or may well blast me. My only anecdotal experience was one otherwise unexplainable curved back in one of my first tanks, equipped with a mag 12.
I like the idea. I like the simplicity of plumbing setup. I don't use submersible pumps in any tank with fish. The last chamber of a multi chamber filter is a good place to put it if that's the way you're going to go.
Mickey the windowman |