I wonder too,(more so after reading that thread!!
), seeing as the 1/2inch Swiftech with it's 'hollow' inside performs dead on par(or better) than all the wierd and wonderful 'maze type' designs.
Seems H20 has 'hit the wall' so to speak,???...
PS, this has'nt stopped me coming up with a wierd and wonderful 'Triple decker' design!
...