H2Andy
Contributor
voop:for the non-anglophones among us, what the heck's a "syphon"?
it's actually pretty straightforward

in a spring system, the water is rushint OUT of the cave, making the in-leg
hard, but the out-leg is with the current, and easy
in a syphon system, the water is rushing INTO the cave, making the in-leg
easy, but the out-leg is against the current, with all the consequences thereof
it's basically a dive that breaks the basic rule of "start your dive into the current"
and therefore needs a little bit more thinking through