So, what's that in litres.. nearly 4L... ok.. so the ones I found were only half the size of the ones Damon showed. Don't think they will be big enough and shipping in from o/s will be too $$$. I think I will explore the jar idea a little more and come up with a cheap DIY version. Do people still put methylene blue in the jars or is that considered 'old fashioned' now? I don't even recall seeing it in LFS for ages though I still use it in my lab with kids in bio classes and we still classify it as non-hazardous.