Phil, Joey, I asked a friend here for some help,he pretty clued up regarding science type products. I wanted an easy to fix vent for my springtail cultures,that was mite proof,it was inspired by something I read stateside. I am still using the simple charcoal/yeast method,but in ever bigger containers,I'm doing ok I suppose,others that see paint a different picture,the phase OMG is often uttered when I show them a seriously producing culture. But therein has been my problem,when I get those stupidly dense cultures ,feeding to keep up means I'm having to open at least every other day or they will suffocate,it's a given.
These little vents are used to grow orchids,tissue culture i guess,simply drill an 8mm hole,I guess 1/4" in the container. Remove all the burrs stick one on. I place this around 3/4 of the way down one side of the container figuring CO2 heavier than air and have not had one crash since,even the silly ones where I can barely see the charcoal for beasties don't crash,how ever hard I've tried to overfeed(obviously within reason) Now these vents won't even let fungal spores through,so providing the ants don't eat through,which I can't be sure on,joey these should help. Naturally they will also allow gas exchange so the sprigs will always have fresh air to breath. O ne vent per culture seems fine so far. I've been using for some months now,and would recomend then without question ,now knowing what they do for us. For iso again i'm unsure if the feeder might munch them but for springtails,brilliant.
i'm sure you'll be able to find something over there,I have a feeling Chuck linked something similar:
http://www.ebay.co.uk/itm/251309139267? ... EBIDX%3AIT
seeya
Stu