Submitted by Derek Baker on Tue, 2012/12/04 - 11:38pm
The diffuser plate is often a weak link in the BSF. It gets damaged or bent, has a shorter lifespan and does not always properly protect the biolayer. We would like to see a better option than the sheet metal diffuser basin - it's hard to make and more expensive.
You can certainly build the mold out of aluminum but it will probably cost about 3 - 5 times more and be much more difficult to weld. You have to be a specialty welder to handle aluminum whereas any welder can handle steel. The material cost would also be more.