QUOTE (geeepwr @ Sep 25 2009, 01:25 PM)

what a superb heads up .which size do you think is better , or would it be worth getting both....(i gues this'd work for dry sift too?)
just looking for a cheapcheerful bubblebag alternative
They'll work for dry sift or bubble. Ideally you'd use 3 - a 200, 100 and 75 (they don't make smaller sizes). The 200 removes all your rubbish, then the 100 will collect everything from 199-100u and the 75 will collect 99-75 (high quality). Bubbleman uses additional screens between 200 and 100u to make the 120u and 90u grades purer by pulling out more rubbish (200, 160).
But for ghetto style, cheapness in the very least I'd do a 200 and a 100. 12 quid and you're rocking....but for the extra 15 quid it's worth the extra level of purity in the 75.
Hope that makes some kind of sense!!
Whilst I'm warbling...I've tried using silkscreens for sifting...43T, 53T and 77T (about 150u, 125u, 75u respectively) and not had much joy. Screens cost between 10 and 20 quid each and were meant to be a cheapo alternative to a bubblebox but just didn't work out, or I can't get my technique right. HOWEVER - you could use them as bubblehash filters if you were very careful about it and poured slowly so no liquid stayed in the frame.
And finally....you can buy micron mesh materials in the UK. Use the keywords "micron mesh" and you'll find stuff. I called to get a quote and the place I spoke to in the NW will do it for around 30 quid a meter (not cheap, but bloody useful). Not ordered any myself yet but they have every micron size you'd ever need.
GN
EDIT: Those socks are only good for removing the contaminants - so useful for a 200u bag (I've got one and use it) but no good at all for collecting trichromes as they get stuck in the fibrous material. For a ghetto bubblebag set I'd get a 200 sock filter as a work bag and then two bucket filters for collecting trichs.