For the water filtration we’ve been using Supor PES membrane filters (.1um), supported using a fancy filter holder from Millipore. (both recommended by Laura Sauder from the University of Waterloo). So far this setup has worked pretty well, although obviously a bit slow when there’s a lot of sediment in the water. However, last night the rubber stopper that holds the thing together cracked and got sucked into the vacuum flask. Which is pretty much a one-way trip… It’ll probably stay there forever. So I looked at the Millipore website and they want $100 + shipping for a replacement stopper! It’s a piece of rubber (well silicone actually) with a hole in it. Sheesh.
So after consulting with Russell in our lab, he directed me to Central Services on campus where I bought a rubber stopper for $1.05 and they drilled the hole for free. As a bonus, it actually fits better and is easier to use than the one that costs one hundred times as much from Millipore.