Maybe relevant....we replaced the AMFA pump with a Johnson VIKING 32.
It seems to pump at about 75% of it's rated flow.
I wonder if it has something to do with the 1.5 meter vertical feed from the sump ??
In any event the Johnson pump drains the sump noticeably faster than the original, which IMHO is a really bad design.
Gulf Harbour...waiting for the wind to die down...