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I ditto RichT's and Concept's thoughts. Although I'm considering looking into a wavebox. They just seem to produce more natural flow.Maybe if EcoTech would come out with their controller I'll consider that.
Marcelo -
CSS can be modded, but the tube in the center can cause problems. You will also end up with quite a bit of turbulence in the chamber.
I know there was a thread up on RC a while ago. I can also see if I can find some pics.
Marcelo -
The shot of him landing came out blurry (lighting was really bad for action shots). He is quite the artist. I took those last two pictures during his testing for his third black belt stripe. A few more pics here http://www.marcelog.net/BB022007/
Marcelo -
You could always put two or three of the same size rubbermaids (one inside the other) to help reduce any bulging. You an also put smaller tubs inside the larger ones to help reduce bubbles, and act as compartments/baffles. You can also cut the top so that it ends up being similar to euro-bracing...