On Wednesday, December 4, 2019 at 1:11:48 AM UTC-5, danny burstein wrote:
In Clare Snyder writes:

Install 2 small sump pumps - one 4 or 5 inches above the other. The
low pump does most of the work, but in heavy water conditions the
second pump takes the excess. This is ONE place where a check valve is
mandatory unless you use 2 outlets (which is not a bad idea - because
if the main discharge gets plugged, causing the sump to overfill, the
second pump has it's own outlet and can still work.

Eyup, that's one of the methods I was considering... But again,
was thinking this is such a common situation someone, somewhere,
must be offering a ready made solution..

Thanks
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Few people would want the extra complication and cost to save, what?
Not much. Just because a pump is rated at 3/4 HP doesn't mean a 3/8 HP
one will use half the energy to move the same amount of water. The lower
rated pump will use somewhat less, but it still has to do the same work,
move the same amount of water. In the grand scheme of things, it's not
worth it.

This is like BMW putting a variable speed aux fan in front of the radiator,
instead of a simple fixed speed one controlled by a thermostatic switch.
It costs $450 and the variable speed electronics sit exposed to high temp,
driving rain, salt in winter, etc. They last a couple years.