Multi-housing systems have housings arranged in parallel. This is because some pressure is lost through the membrane, and the second ans subsequent housings in series would have less driving pressure without enhancement.
We've included half-metre elements and housings in our product array. And we'll provide small versions of filter units for pilot scale testing. Most customers validate the performance of ceramic membranes in laboratory or pilot scale systems. We encourage this, especially at the pilot scale, since operating parameters become clearer.