On Thu, 10 Nov 2005 17:41:47 -0600, "Koi-lo"
wrote:

These pumps come with a ceramic shaft this is hard to replace. Unlike metal
shafts they wear out. I've had one on back order now for over 3 months. My
husband made one from a coat hanger that does allow the pump to work. This
is the last Tetra pump I will ever buy. Tetra will not sell to people
directly.

My guess, location, location, location. The survivors were probably the
furthest from the inflow. ~ jan