"George" wrote in message
...

"Rob" wrote in message
om...
I can't quite figure out the tubing thing: many sites recommend the
black spiral tubing

The tubing use is clear polyehtylene, [sp] smooth tubing.
You can buy it at any hardware store.

The big box stores carry a variety, sure, but won't the cheap stuff collapse
under suction?
The hydrodynamics of tubing have to consider the buildup of plaque or gunque
over time, too. My theory is the turbulence helps clear the walls of stuff
without restricting the flow as much as you might think.
--
Crashj "that's my theory and I'm sticking to it!" Johnson